Glossary of Plant Anatomy

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salt gland [PO:0005661; plant anatomy term ]
A specialized tissue where excess salt absorbed in water from the soil is concentrated, being stores or excreted.
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sapwood [PO:0004513; plant anatomy term ]
A portion of secondary xylem (PO:0005848) that has as parts living secondary xylem parenchyma cells (PO:0004525).
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scale leaf [PO:0006003; plant anatomy term ]
A phyllome that is reduced in size relative to a vascular leaf on the same plant and is often associated with a perennating or dormant bud or a vegetatively propagating organ such as a rhizome.
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scale leaf margin [PO:0025014; plant anatomy term ]
The margin of a scale leaf.
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sclerenchyma [PO:0005427; plant anatomy term ]
A supporting tissue composed of fibers or sclereids.
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sclerenchyma cell [PO:0000077; plant anatomy term ]
A ground tissue cell (PO:0025030) with a lignified secondary cell wall.
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sclerid cell [PO:0025418; plant anatomy term ]
A sclerenchyma cell (PO:0000077) with many pits in the secondary cell wall.
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scutellar epithelium [PO:0008048; plant anatomy term ]
A continuous layer of cylindrical cells covering the endosperm side of the scutellum. Thought to act as a secretory and absorptive organ.
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scutellar node [PO:0004708; plant anatomy term ]
A stem node that is the part of an embryo axis directly above the radicle where the scutellum is attached.
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scutellar vascular system [PO:0008047; plant anatomy term ]
A vascular system in a scutellum.
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scutellum [PO:0020110; plant anatomy term ]
An embryonic plant structure that is a more or less shield-shaped and absorptive portion of a plant embryo of Poaceae.
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scutellum epidermis [PO:0006049; plant anatomy term ]
A portion of shoot epidermis that is part of the scutellum.
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second order inflorescence [PO:0025240; plant anatomy term ]
A reproductive shoot system (PO:0025082) that is part of an inflorescence (PO:0009049) and has as parts a second order inflorescence axis (PO:0006321) and any shoot axes (PO:0025029) and flowers (PO:0009046) that arise from it.
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second order inflorescence branch [PO:0006322; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from a primary inflorescence branch (PO:0006321).
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second order infructescence [PO:0025241; plant anatomy term ]
A reproductive shoot system that is part of an infructescence and has as parts a second order infructescence axis and any infructescence axes and fruits that arise from it.
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second order infructescence branch [PO:0025113; plant anatomy term ]
An infructescence branch (PO:0025243) arising from a primary infructescence branch (PO:0025112).
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secondary leaf vein [PO:0020140; plant anatomy term ]
A leaf lamina vein (PO:0020138) arising from a primary leaf vein (PO:0025413).
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secondary phloem [PO:0005043; plant anatomy term ]
A portion of phloem (PO:0005417) tissue that develops from a vascular cambium (PO:0005598).
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secondary phloem sieve cell [PO:0025456; plant anatomy term ]
A sieve cell (PO:0025415) that is part of a portion of secondary phloem (PO:0005043).
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secondary phloem sieve element [PO:0025453; plant anatomy term ]
A sieve element (PO:0025406) that is part of a portion of secondary phloem (PO:0005043).
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secondary phloem sieve tube element [PO:0025457; plant anatomy term ]
A sieve tube element (PO:0000289) that is part of a portion of secondary phloem (PO:0005043).
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secondary thickening meristem [PO:0025414; plant anatomy term ]
A lateral meristem (PO:0020145) that is not contiguous with an apical meristem (PO:0020144) and has a parts multiple layers of meristematic cells (PO:0004010).
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secondary vascular tissue [PO:0025409; plant anatomy term ]
A portion of vascular tissue (PO:0009015) that develops from a vascular cambium (PO:0005598).
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secondary xylem [PO:0005848; plant anatomy term ]
A portion of xylem (PO:0005352) tissue that develops from a vascular cambium (PO:0005598).
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secondary xylem parenchyma [PO:0004532; plant anatomy term ]
A portion of parenchyma (PO:0005421) tissue that is part of a portion of secondary xylem (PO:0005848) and has as parts secondary xylem parenchyma cells (PO:0004525).
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secondary xylem parenchyma cell [PO:0004525; plant anatomy term ]
A parenchyma cell (PO:0000074) that is part of a portion of secondary xylem parenchyma (PO:0004532).
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secondary xylem tracheary element [PO:0025445; plant anatomy term ]
A tracheary element (PO:0000290) that is part of a portion of secondary xylem tissue (PO:0005848).
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secondary xylem tracheid [PO:0025447; plant anatomy term ]
A tracheid PO:0000301 that is part of a portion of secondary xylem tissue (PO:0005848).
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secondary xylem vessel [PO:0025451; plant anatomy term ]
A xylem vessel (PO:0025417) that is part of a portion of secondary xylem tissue (PO:0005848).
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secondary xylem vessel member [PO:0025449; plant anatomy term ]
A xylem vessel member (PO:0002003) that is part of a portion of secondary xylem tissue (PO:0005848).
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seed [PO:0009010; plant anatomy term ]
A multi-tissue plant structure (PO:0025496) that develops from a plant ovule (PO:0020003) and has as parts a plant embryo (PO:0009009) enclosed in a seed coat (PO:0009088).
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seed chalaza [PO:0006333; plant anatomy term ]
A remnant of the ovular chalaza that is part of the seed.
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seed coat [PO:0009088; plant anatomy term ]
A portion of plant tissue that is the covering of a seed derived from ovular - mainly integumentary - tissue.
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seed coat epidermis [PO:0006048; plant anatomy term ]
A portion of epidermis that is part of a seed coat.
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seed funicle [PO:0006332; plant anatomy term ]
A cardinal part of multi-tissue plant structure (PO:0025498) that is attached to a seed (PO:0009010) and is the remnants of a funicle (PO:0020006).
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seed micropyle [PO:0006334; plant anatomy term ]
A plant anatomical space that is enclosed by and forms an opening in a seed coat at the apex of a seed and is the remnant of a micropyle.
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seed obturator [PO:0006336; plant anatomy term ]
An outgrowth of the seed funicle, that forms a bridge between the seed micropyle and other tissues. It is also a remnant form of the obturator found in the ovular funicle.
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seed operculum [PO:0019024; plant anatomy term ]
A plug-like structure formed in the micropylar region of the seed coat.
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seed raphe [PO:0006331; plant anatomy term ]
A cardinal part of multi-tissue plant structure (PO:0025498) that is a ridge on a seed (PO:0009010) that develops from a raphe (PO:0020027).
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seed storage parenchyma [PO:0025067; plant anatomy term ]
A portion of storage parenchyma that is part of a seed.
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seed trichome [PO:0004511; plant anatomy term ]
A trichome that develops from seed coat epidermis.
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seedling coleoptile [PO:0025287; plant anatomy term ]
A coleoptile (PO:0020033) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seedling coleorhiza [PO:0025289; plant anatomy term ]
A coleorhiza (PO:0020034) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seedling cotyledon [PO:0025471; plant anatomy term ]
A cotyledon (PO:0020030) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seedling epicotyl [PO:0025293; plant anatomy term ]
An epicotyl (PO:0020035) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seedling hypocotyl [PO:0025291; plant anatomy term ]
A hypocotyl (PO:0020100) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seedling hypocotyl-root junction [PO:0025301; plant anatomy term ]
A hypocotyl-root junction (PO:0004724) that develops from an embryo hypocotyl-root junction (PO:0025300) .
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seedling mesocotyl [PO:0025295; plant anatomy term ]
A mesocotyl (PO:0020037) that develops from an embryo mesocotyl (PO:0025294).
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seedling radicle [PO:0025297; plant anatomy term ]
A radicle (PO:0020031) that is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).
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seminal root [PO:0000046; plant anatomy term ]
An embryo root (PO:0000045) formed within the scutellar node (PO:0004708) of the plant embryo (PO:0009009) in some monocotyledonous plants.
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sepal [PO:0009031; plant anatomy term ]
A phyllome (PO:0006001) that is usually green, and is part of the calyx (PO:0009060).
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sepal abaxial epidermis [PO:0006054; plant anatomy term ]
A portion of sepal epidermis that covers the abaxial/lower surface of a sepal.
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sepal adaxial epidermis [PO:0006055; plant anatomy term ]
A portion of sepal epidermis that covers the adaxial/upper surface of a sepal.
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sepal anlagen [PO:0025485; plant anatomy term ]
A phyllome anlagen (PO:0025430) that will give rise to a sepal primordium (PO:0004704) and is part of a peripheral zone (PO:000225) of a flower meristem (PO:0000229).
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sepal apex [PO:0025145; plant anatomy term ]
A phyllome apex that is part of a sepal.
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sepal base [PO:0025147; plant anatomy term ]
A phyllome base that is part of a sepal.
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sepal epidermis [PO:0006040; plant anatomy term ]
A portion of phyllome epidermis that is part of a sepal.
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sepal epidermis giant cell [PO:0025499; plant anatomy term ]
An epidermal pavement cell (PO:0000332) that is part of sepal epidermis (PO:0006040) and is approximately one fifth the length of a sepal.
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sepal margin [PO:0005021; plant anatomy term ]
The margin of a sepal.
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sepal mesophyll [PO:0006072; plant anatomy term ]
The chloroplast-containing, photosynthetic parenchymatous tissue situated between the two epidermal layers of the sepal.
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sepal parenchyma [PO:0006068; plant anatomy term ]
A portion of parenchyma tissue that is part of a sepal.
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sepal primordium [PO:0004704; plant anatomy term ]
A phyllome primordium (PO:0025128) that develops from a sepal anlagen (PO:0025485) and is committed to the development of a sepal (PO:0009031).
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sepal stomatal complex [PO:0025219; plant anatomy term ]
A phyllome stomatal complex that is part of a sepal.
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sepal tip [PO:0025150; plant anatomy term ]
A phyllome tip that is part of a sepal apex.
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sepal trichome [PO:0025182; plant anatomy term ]
A phyllome trichome that is part of a sepal epidermis.
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sepal vascular system [PO:0004723; plant anatomy term ]
A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a sepal.
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separation layer [PO:0006211; plant anatomy term ]
A portion of plant tissue (PO:0009007) that is part of an abscission zone (PO:0000146) and contains cells that develop an abnormal wall chemistry and swelling resulting in their easily being pulled apart along the pectin-rich middle lamella (GO:0009519).
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septate fiber cell [PO:0004521; plant anatomy term ]
A plant fiber cell (PO:0025407) with thin transverse walls (septa), which are formed when mitosis occurs within the cell after development of a secondary cell wall (GO:0009531).
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septate fiber tracheid [PO:0025419; plant anatomy term ]
A fiber tracheid (PO:0000355) that has as parts one or more thin internal partitions or septa.
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septate libriform fiber cell [PO:0025420; plant anatomy term ]
A libriform fiber cell (PO:0004520) that has as parts one or more thin internal partitions or septa.
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septate phloem fiber cell [PO:0025421; plant anatomy term ]
A phloem fiber cell (PO:0004519) that has as parts one or more thin internal partitions or septa.
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septum [PO:0000030; plant anatomy term ]
A collective organ part structure composed of two or more layers of various tissues that is a partition that divides a cavity formed by the fusion of two or more organs.
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seta [PO:0030032; plant anatomy term ]
A stalk (PO:0025066) that supports a spore capsule, the sporangium (PO:0025094).
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seta meristematic apical cell [PO:0030016; plant anatomy term ]
A shoot axis meristematic apical cell at the tip of a seta.
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seventh order inflorescence branch [PO:0025109; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from a sixth order inflorescence branch (PO:0025108).
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seventh order infructescence branch [PO:0025253; plant anatomy term ]
An infructescence branch (PO:0025243) arising from a sixth order infructescence branch (PO:0025252).
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sheath cell [PO:0004531; plant anatomy term ]
Cell on the margin of, and tending to form a sheath around, the procumbent cells of a multi-seriate ray as seen in tangential section.
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shoot apex [PO:0000037; plant anatomy term ]
A shoot axis (PO:0025029) that is the most distal part of a shoot system (PO:0009006) and has as parts a shoot apical meristem (PO:0020148) and the youngest primordia (PO:0025127).
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shoot apical meristem [PO:0020148; plant anatomy term ]
A shoot system meristem (PO:0006079) formed at the apex of the shoot axis (PO:0025029), including those originating from an axillary bud meristem (PO:0000232).
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shoot axis [PO:0025029; plant anatomy term ]
A plant axis (PO:0025004) that is part of a shoot system (PO:0009006).
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shoot axis cambial zone [PO:0025440; plant anatomy term ]
A cambial zone that is part of a shoot axis (PO:0025029).
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shoot axis cork cambium [PO:0025435; plant anatomy term ]
A cork cambium (PO:0005599) that is part of a shoot axis (PO:0025029).
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shoot axis cortex [PO:0000223; plant anatomy term ]
A portion of cortex (PO:0005708) that is part of a shoot axis (PO:0025029).
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shoot axis endodermis [PO:0005058; plant anatomy term ]
A portion of endodermis (PO:0000252) that is part of a shoot axis cortex (PO:0000223).
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shoot axis epidermis [PO:0000112; plant anatomy term ]
A portion of shoot system epidermis (PO:0006035) that is part of a shoot axis (PO:0025029).
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shoot axis hypodermis [PO:0005057; plant anatomy term ]
A portion of shoot axis hypodermis (PO:0005057) that is part of a stem cortex (PO:0000223).
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shoot axis internode [PO:0005005; plant anatomy term ]
A cardinal organ part (PO:0025001) of a shoot axis (PO:0025029) that is between two shoot axis nodes (PO:0005004).
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shoot axis meristematic apical cell [PO:0030010; plant anatomy term ]
A shoot meristematic apical cell that is part of a shoot apex.
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shoot axis node [PO:0005004; plant anatomy term ]
A cardinal organ part (PO:0025001) of a shoot axis (PO:0025029) where a bud (PO:0000055) may form and develop into a branch (PO:0025073), leaf (PO:0025034), flower (PO:0004541), inflorescence (PO:0009049) or nodal root (PO:0003005).
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shoot axis periderm [PO:0005048; plant anatomy term ]
A portion of periderm that is part of a shoot axis.
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shoot axis perimedullary zone [PO:0025064; plant anatomy term ]
A perimedullary zone (PO:0025058) that is part of a shoot axis pith (PO:0005041).
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shoot axis pith [PO:0005041; plant anatomy term ]
A portion of pith (PO:0006109) that is part of a shoot axis (PO:0025029).
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shoot axis prickle [PO:0025171; plant anatomy term ]
A prickle that is part of a shoot axis.
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shoot axis procambium [PO:0025260; plant anatomy term ]
A portion of shoot procambium that is part of a shoot apical meristem and gives rise to the primary vascular tissue of a shoot axis.
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shoot axis stele [PO:0025198; plant anatomy term ]
A stele that is part of a shoot axis.
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shoot axis tegument layer [PO:0025609; plant anatomy term ]
A portion of plant tissue (PO:0009007) that forms a tough, protective outer layer on a shoot axis and includes as parts a shoot axis hypodermis (PO:0005057) and a shoot axis epidermis (PO:0000112).
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shoot axis trichome [PO:0005003; plant anatomy term ]
A trichome that is part of a shoot axis epidermis.
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shoot axis tuber [PO:0004543; plant anatomy term ]
A tuber (PO:0025522) that develops from a branch (PO:0025073).
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shoot axis tuber axillary bud meristem [PO:0025068; plant anatomy term ]
An axillary bud meristem (PO:0000232) that is part of a shoot axis tuber (PO:0004543).
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shoot axis tuber axillary vegetative bud [PO:0025040; plant anatomy term ]
An axillary vegetative bud (PO:0004712) that is part of a shoot axis tuber (PO:0004543).
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shoot axis tuber epidermis [PO:0025046; plant anatomy term ]
A portion of shoot axis epidermis (PO:0000112) that is part of a shoot axis tuber (PO:0004543).
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shoot axis tuber periderm [PO:0025043; plant anatomy term ]
A portion of shoot axis periderm (PO:0005048) that is part of a shoot axis tuber (PO:0004543).
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shoot axis vascular cambium [PO:0025437; plant anatomy term ]
A vascular cambium (PO:0005598) that is part of a shoot axis (PO:0025029).
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shoot axis vascular system [PO:0000039; plant anatomy term ]
A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a shoot axis.
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shoot epidermal cell [PO:0025165; plant anatomy term ]
An epidermal cell that is part of a shoot epidermis.
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shoot internode differentiation zone [PO:0025102; plant anatomy term ]
A plant axis differentiation zone that is part of a shoot axis.
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shoot internode elongation zone [PO:0025100; plant anatomy term ]
A plant axis elongation zone that is part of a shoot axis internode.
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shoot lateral meristem [PO:0006344; plant anatomy term ]
A lateral meristem (PO:0020145) that is part of a shoot axis (PO:0025029).
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shoot meristematic apical cell [PO:0030009; plant anatomy term ]
A meristematic apical cell that is part of a shoot system.
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shoot procambium [PO:0025276; plant anatomy term ]
A portion of procambium (PO:0025275) tissue that is part of a shoot system (PO:0009006).
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shoot system [PO:0009006; plant anatomy term ]
A collective plant organ structure (PO:0025007) that produces shoot-borne portions of meristem tissue (PO:0009013) and the plant structures (PO:0009011) that arise from them.
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shoot system epidermis [PO:0006035; plant anatomy term ]
A portion of epidermis (PO:0005679) that is part of a shoot system (PO:0009006) and arises from the meristem L1 layer (PO:0009020).
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shoot system exarch protoxylem [PO:0025556; plant anatomy term ]
A portion of exarch protoxylem (PO:002554) tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the plant axis (PO:0025004).
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shoot system ground meristem [PO:0025595; plant anatomy term ]
A ground meristem (PO:0025594) that gives rise to a portion of ground tissue (PO:0025059) in the shoot system (PO:0009006).
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shoot system meristem [PO:0006079; plant anatomy term ]
A portion of meristem tissue (PO:0009013) that is part of a shoot system (PO:0009006).
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shoot system phloem sap [PO:0025566; plant anatomy term ]
A phloem sap (PO:0025540) that is located in the shoot system (PO:0009006).
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shoot system vascular system [PO:0025205; plant anatomy term ]
A vascular system that is part of a shoot system.
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shoot system xylem sap [PO:0025565; plant anatomy term ]
A xylem sap (PO:0025539) that is located in the shoot system (PO:0009006).
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shoot-borne internode root [PO:0025593; plant anatomy term ]
A shoot-borne root (PO:0000042) that arises from a shoot axis internode (PO:0005005).
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shoot-borne nodal root [PO:0003005; plant anatomy term ]
A shoot-borne root (PO:0000042) that forms at a shoot axis node (PO:0005004).
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shoot-borne root [PO:0000042; plant anatomy term ]
A root (PO:0009005) that develops from shoot axis (PO:0025029) tissue.
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shoot-borne root apical meristem [PO:0006021; plant anatomy term ]
A root apical meristem (PO:0020147) that gives rise to a shoot-borne root (PO:0000042).
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shoot-borne root epidermis [PO:0006039; plant anatomy term ]
A portion of root epidermis (PO:0006036) that is part of a shoot-borne root (PO:0000042).
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shoot-borne root primordium [PO:0025480; plant anatomy term ]
A root primordium (PO:0005029) that is committed to the development of a shoot-borne root (PO:0000042).
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shoot-borne shoot system [PO:0004545; plant anatomy term ]
A shoot system that is initiated from a shoot.
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short cell [PO:0004718; plant anatomy term ]
An isodiametric leaf pavement cell.
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short shoot [PO:0004701; plant anatomy term ]
Shoot system in which the internodes elongate little or at all, bearing reproductive structures and/or leaves.
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short tassel branch [PO:0009102; plant anatomy term ]
The very short branch that may arise from either or both the long lateral branch and the central spike of tassel in maize.
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short tassel branch meristem [PO:0009103; plant anatomy term ]
The meristem present on either or both the long lateral branch and central spike of a maize tassel that gives rise to short tassel branch.
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sieve cell [PO:0025415; plant anatomy term ]
A sieve element (PO:0025406) in which the sieve areas are not aggregated into sieve plates (GO:0097218).
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sieve element [PO:0025406; plant anatomy term ]
A native plant cell (PO:0025606) that is part of a portion of phloem tissue (PO:0005417), has sieve areas in its walls, and lacks a nucleus in its mature protoplast.
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sieve tube [PO:0025416; plant anatomy term ]
A portion of phloem tissue (PO:0005417) that has as parts a series of sieve tube elements (PO:0000289) arranged end to end and interconnected through sieve plates.
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sieve tube element [PO:0000289; plant anatomy term ]
A sieve element (PO:0025406) that is part of a sieve tube (PO:0025416) and has as parts sieve areas aggregated into sieve plates (GO:0097218).
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silica cell [PO:0004009; plant anatomy term ]
Cells with deposits of silica in them. One of the two types of short cells in the epidermis of grasses and bamboos. It is usually paired with epidermal cork cell.
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silk scar [PO:0002004; plant anatomy term ]
The silk scar is composed of the shrivelled remains of the intercalary region of the silk, together with the base of the silk which is the true stylar tissue of the silk arising from the distal end of the developing kernel (caryopsis).
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simple leaf [PO:0020042; plant anatomy term ]
A leaf in which the lamina is undivided.
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sixth order inflorescence branch [PO:0025108; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from a fifth order inflorescence branch (PO:0025107).
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sixth order infructescence branch [PO:0025252; plant anatomy term ]
An infructescence branch (PO:0025243) arising from a fifth order infructescence branch (PO:0025116).
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socket cell [PO:0000115; plant anatomy term ]
A shoot epidermal cell (PO:0025165) that surrounds a trichome (PO:0000282) and provides its support.
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somatic plant embryo [PO:0025302; plant anatomy term ]
A plant embryo (PO:0009009) that arises from previously differentiated somatic cells, rather than from fused gametes, i.e. the plant zygote (PO:0000423).
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sorus [PO:0025359; plant anatomy term ]
A collective plant organ structure (PO:0025007) on the surface of a vascular leaf (PO:0009025) that has as part a cluster of two or more adjacent sporangia PO:0025094).
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spermatogenous cell [PO:0025525; plant anatomy term ]
A native plant cell (PO:0025606) that gives rise to one or more plant sperm cells (PO:0000084).
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spikelet [PO:0009051; plant anatomy term ]
A reproductive shoot system (PO:0025082) that is the ultimate and congested inflorescence branch (PO:0009081) of the grasses.
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spikelet floret [PO:0009082; plant anatomy term ]
A small flower (PO:0009046) that is part of a spikelet (PO:0009051).
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spikelet meristem [PO:0006327; plant anatomy term ]
An inflorescence apical meristem that gives rise to the two or more florets of a grass inflorescence.
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spikelet pair meristem [PO:0006328; plant anatomy term ]
The meristem that produces two spikelet meristems, each of which produces two floral meristems.
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spikelet pedicel [PO:0006319; plant anatomy term ]
Inflorescence branch that terminates in a spikelet.
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spikelet rachilla [PO:0009080; plant anatomy term ]
The axis of the spikelet, above the glumes.
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spine leaf [PO:0025173; plant anatomy term ]
A leaf that is a sclerified and pointed and lacks a lamina.
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spine petiole [PO:0025613; plant anatomy term ]
A petiole (PO:0020038) that is sclerified and persistent.
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spine stipule [PO:0025174; plant anatomy term ]
A stipule that is sclerified and pointed.
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spongy mesophyll [PO:0005647; plant anatomy term ]
Leaf mesophyll parenchyma characterized by little elongated cells, that are not closely packed and have conspicuous intercellular spaces.
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spongy mesophyll cell [PO:0006205; plant anatomy term ]
Irregularly-shaped, chlorenchymatous cell, separated by large air spaces.
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spongy mesophyll intercellular space [PO:0025381; plant anatomy term ]
A leaf mesophyll intercellular space that is part of a spongy mesophyll.
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sporangium [PO:0025094; plant anatomy term ]
A plant organ (PO:0009008) in which plant spores (PO:0025017) are produced.
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sporangium base [PO:0030040; plant anatomy term ]
A cardinal organ part that is the basal (distal) part of a sporangium.
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sporangium locule [PO:0025265; plant anatomy term ]
A locule that is a cavity in a sporangium or several fused sporangia.
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sporangium theca [PO:0030041; plant anatomy term ]
A cardinal organ part that is the main body of a sporangium and has spores located in it.
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sporangium wall [PO:0025306; plant anatomy term ]
A cardinal organ part (PO:0025001) that is composed of the outer layers of a sporangium (PO:0025094) and bounds the archesporium (PO:0030074) or plant spores (PO:0025017).
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sporangium wall endothecium [PO:0030049; plant anatomy term ]
A portion of ground tissue PO:0025059) that is the sub-epidermal layer of a sporangium wall (PO:0025306).
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spore capsule annulus [PO:0025093; plant anatomy term ]
A dehiscence zone that is part of a spore capsule.
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spore capsule calyptra [PO:0030037; plant anatomy term ]
A cardinal organ part (PO:0025001) that develops from an archegonium (PO:0025126) and is a cap or hood enclosing the sporangium (syn: spore capsule; PO:0025094).
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spore capsule columella [PO:0025231; plant anatomy term ]
A columella that forms the central axis of a spore capsule.
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spore capsule mouth [PO:0030017; plant anatomy term ]
A plant anatomical space that is the opening on the apical end of a spore capsule.
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spore capsule operculum [PO:0030044; plant anatomy term ]
A cardinal organ part that is the apical part of a spore capsule that separates from the rest of the capsule during dehiscence.
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spore capsule valve [PO:0025229; plant anatomy term ]
A valve that is a part of a spore capsule that splits apart when the spore capsule dehisces.
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sporocyte [PO:0006204; plant anatomy term ]
A native plant cell (PO:0025606) which is diploid (2n), and undergoes meiosis (GO:0007126) to produce four haploid (1n) plant spores (PO:0025017).
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sporophyll [PO:0009026; plant anatomy term ]
A leaf-like organ on which one or more sporangia are borne.
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sporophyll margin [PO:0025016; plant anatomy term ]
The margin of a sporophyll.
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sporophyte foot [PO:0030029; plant anatomy term ]
A plant organ that is the base of a whole plant in the sporophytic phase and attaches it to the gametophore.
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sporophyte meristematic apical cell [PO:0030015; plant anatomy term ]
A meristematic apical cell that is part of a whole plant in the sporophytic phase.
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stalk [PO:0025066; plant anatomy term ]
A cardinal organ part (PO:0025001) that is elongated and sub-cylindrical to cylindrical and supports another cardinal organ part.
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stamen [PO:0009029; plant anatomy term ]
A microsporophyll bearing one or more microsporangia.
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stamen anlagen [PO:0025486; plant anatomy term ]
A phyllome anlagen (PO:0025430) that will give rise to a stamen primordium (PO:0004705) and is part of a peripheral zone (PO:000225) of a flower meristem (PO:0000229).
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stamen epidermis [PO:0025097; plant anatomy term ]
A portion of phyllome epidermis that is part of a stamen.
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stamen margin [PO:0025020; plant anatomy term ]
The margin of a stamen.
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stamen primordium [PO:0004705; plant anatomy term ]
A phyllome primordium (PO:0025128) that develops from a stamen anlagen (PO:0025486) and is committed to the development of a stamen (PO:0009029).
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stamen stomatal complex [PO:0025220; plant anatomy term ]
A phyllome stomatal complex that is part of a stamen.
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stamen trichome [PO:0025209; plant anatomy term ]
A phyllome trichome that is part of a stamen epidermis.
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stamen vascular system [PO:0005018; plant anatomy term ]
A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a stamen.
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staminate flower [PO:0025600; plant anatomy term ]
A flower (PO:0009046) that includes as part an androecium (PO:0009061), and the gynoecium (PO:0009062) is absent or has aborted during development.
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staminate inflorescence [PO:0025601; plant anatomy term ]
An inflorescence (PO:0009049) that includes as part only staminate flowers (PO:0025600).
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staminode [PO:0009077; plant anatomy term ]
Sterile stamen.
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stele [PO:0025197; plant anatomy term ]
A cardinal organ part (PO:0025001) that is the central column of a plant axis that consists of the primary vascular tissue and associated ground tissue.
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stem [PO:0009047; plant anatomy term ]
A shoot axis (PO:0025029) that is the primary axis of a plant.
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stem aerenchyma [PO:0006214; plant anatomy term ]
A portion of aerenchyma that is part of a stem.
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stem apex tendril [PO:0025365; plant anatomy term ]
A shoot axis that arises from the apical part of a stem and is slender and coiling.
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stem base [PO:0008039; plant anatomy term ]
The basal part of stem.
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stem cortex [PO:0025612; plant anatomy term ]
A portion of shoot axis cortex (PO:0000223) that is part of a stem (PO:0009047).
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stem epidermis [PO:0025178; plant anatomy term ]
A portion of shoot axis epidermis (PO:0000112) that is part of a stem (PO:0009047).
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stem hypodermis [PO:0025610; plant anatomy term ]
A portion of hypodermis (PO:0005051) that is part of a stem cortex (PO:0025612).
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stem intercalary meristem [PO:0006347; plant anatomy term ]
An intercalary meristem (PO:0006073) that is part of a stem internode (PO:0020142) and is intercalated between two portions of non-meristematic tissue.
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stem internode [PO:0020142; plant anatomy term ]
A shoot axis internode (PO:0005005) that is part of a stem (PO:0009047).
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stem internode differentiation zone [PO:0008042; plant anatomy term ]
A shoot internode differentiation zone that is part of a stem internode.
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stem internode elongation zone [PO:0008041; plant anatomy term ]
A shoot internode elongation zone that is part of a stem internode.
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stem node [PO:0020141; plant anatomy term ]
A shoot node that is part of a stem.
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stem procambium [PO:0025273; plant anatomy term ]
A portion of shoot axis procambium gives rise to the primary vascular tissue of a stem.
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stem secondary thickening meristem [PO:0025442; plant anatomy term ]
A secondary thickening meristem (PO:0025414) that is part of a stem (PO:0009047).
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stem stele [PO:0025200; plant anatomy term ]
A shoot axis stele that is part of a stem.
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stem tegument layer [PO:0025611; plant anatomy term ]
A portion of shoot axis tegument layer (PO:0025609) that a tough, protective outer layer on a stem (PO:0009047) and includes as parts a stem hypodermis (PO:0025610) and a stem epidermis (PO:0025178).
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stem trichome [PO:0025176; plant anatomy term ]
A shoot axis trichome that is part of a stem epidermis.
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stereid [PO:0030045; plant anatomy term ]
A ground tissue cell with thickened cell walls.
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stereome [PO:0030050; plant anatomy term ]
A portion of ground tissue that has as parts stereid cells and no other cell types.
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sterile lemma [PO:0009040; plant anatomy term ]
A flower bract in the position of a lemma, but not enclosing floral organs.
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stigma [PO:0009073; plant anatomy term ]
A cardinal organ part that is part of a carpel or group of fused carpels on which the pollen germinates, usually apical.
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stigma epidermis [PO:0006061; plant anatomy term ]
A portion of carpel epidermis that is part of a stigma.
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stigma papilla cell [PO:0025168; plant anatomy term ]
A papilla cell that is part of a stigma epidermis.
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stigma vascular system [PO:0008012; plant anatomy term ]
A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a stigma.
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stipel [PO:0020051; plant anatomy term ]
Stipule-like appendage(s) at the base of a leaflet (in unifoliolate or simple leaves, found at the top of the petiole).
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stipule [PO:0020041; plant anatomy term ]
A cardinal organ part that is an appendage at the base of a vascular leaf.
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stolon [PO:0003024; plant anatomy term ]
A branch that is slender, prostrate or trailing and above-ground and produces roots and sometimes erect shoots at its nodes.
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stomatal complex [PO:0002000; plant anatomy term ]
A portion of shoot epidermis that has as parts two guard cells and a stomatal pore. May also contain subsidiary cells.
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stomatal initial cell [PO:0000062; plant anatomy term ]
An epidermal initial cell (PO:0000349) that undergoes several rounds of uneven division, each time giving rise to a larger daughter cell that differentiates into an epidermal ground cell and a smaller daughter cell that remains meristematic, until the meristematic cell (PO:0004010) differentiates into a guard mother cell (PO:0000351).
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stomatal pore [PO:0008032; plant anatomy term ]
A plant anatomical space that forms an opening in an epidermis, flanked by two guard cells.
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stomium [PO:0020101; plant anatomy term ]
A plant anatomical space that is a slit in an anther lobe formed from when a dehiscence zone dehisces.
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storage parenchyma [PO:0025035; plant anatomy term ]
A portion of parenchyma (PO:0005421) specialized for carbohydrate storage.
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strobilus [PO:0025083; plant anatomy term ]
A reproductive shoot system (PO:0025082) consisting of a number of sporophylls (PO:0009026) or plant ovule (PO:0020003)-bearing modified leaves (PO:0025034) grouped terminally on a stem (PO:0009047).
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strobilus bud [PO:0025085; plant anatomy term ]
A bud that develops into a strobilus.
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strophiole [PO:0019023; plant anatomy term ]
An arilloid that is an outgrowth of a seed on a raphe.
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style [PO:0009074; plant anatomy term ]
An elongated part of a carpel or group of fused carpels between the ovary and the stigma, and through which the pollen tube grows.
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style epidermis [PO:0006062; plant anatomy term ]
A portion of carpel epidermis that is part of a style.
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subsidiary cell [PO:0000284; plant anatomy term ]
An epidermal cell associated with a stoma and at least morphologically distinguishable from the other epidermal cells.
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substomatal cavity [PO:0025382; plant anatomy term ]
An intercellular space that is located directly below and contiguous with a stomatal pore.
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subterranean tuber [PO:0004547; plant anatomy term ]
A shoot axis tuber (PO:0004543) that develops below ground.
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subterranean tuber axillary bud meristem [PO:0025070; plant anatomy term ]
A tuber axillary bud meristem that is part of a subterranean tuber.
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subterranean tuber axillary shoot [PO:0025081; plant anatomy term ]
An axillary shoot that develops from a subterranean tuber axillary bud.
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subterranean tuber axillary vegetative bud [PO:0025042; plant anatomy term ]
A tuber axillary vegetative bud that is part of a subterranean tuber.
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subterranean tuber cortex [PO:0025057; plant anatomy term ]
A portion of tuber cortex that is part of a subterranean tuber storage parenchyma.
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subterranean tuber epidermis [PO:0025048; plant anatomy term ]
A tuber epidermis that is part of a subterranean tuber.
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subterranean tuber interfascicular region [PO:0025049; plant anatomy term ]
A tuber interfascicular region that is part of a subterranean tuber storage parenchyma.
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subterranean tuber periderm [PO:0025045; plant anatomy term ]
A portion of tuber periderm that is part of a subterranean tuber.
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subterranean tuber perimedullary zone [PO:0025063; plant anatomy term ]
A tuber perimedullary zone that is part of a subterranean tuber pith.
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subterranean tuber pith [PO:0025053; plant anatomy term ]
A portion of tuber pith (PO:0025052) that is part of a subterranean tuber storage parenchyma (PO:0025038).
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subterranean tuber storage parenchyma [PO:0025038; plant anatomy term ]
A portion of tuber storage parenchyma (PO:0025035) that is part of a subterranean tuber (PO:0004547).
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suspensor [PO:0020108; plant anatomy term ]
An embryonic plant structure at the base of a plant embryo that develops from an embryonic basal cell and connects an embryo proper to the wall of a megagametophyte.
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synergid [PO:0000191; plant anatomy term ]
Cell, usually two in number, in the micropylar end of the embryo sac of angiosperms associated with the egg in the egg apparatus.
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