Glossary of Plant Anatomy

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abaxial epidermis of ovary [PO:0005023; plant anatomy term ]
The epidermal cell layer of the abaxial/outer surface of the ovary.
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abaxial nucellar projection [PO:0008009; plant anatomy term ]
A portion of plant tissue that is the abaxial/lower portion of the nucellus overlying the vascular strands in the grass caryopsis.
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abaxial petiole canal [PO:0025238; plant anatomy term ]
A petiole canal on the abaxial surface of a petiole.
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abaxial protoderm [PO:0006082; plant anatomy term ]
A portion of protoderm (PO:0006210) tissue that is the outermost layer of the shoot apical meristem (PO:0020148), and gives rise to the leaf abaxial epidermis (PO:0006019).
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abscission zone [PO:0000146; plant anatomy term ]
A portion of plant tissue (PO:0009007) that has as part a separation layer (PO:0006211) and a protective layer (PO:0006212), and is involved in the abscission (GO:0009838) of a fruit (PO:0009001), flower (PO:0009046), leaf (PO:0025034) or other plant structure (PO:0009011).
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accessory paraclade [PO:0025546; plant anatomy term ]
A primary inflorescence branch (PO:0006321) borne in the same axil (PO:0025224) as an existing primary inflorescence branch (PO:0006321).
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adaxial epidermis of ovary [PO:0005024; plant anatomy term ]
The epidermal cell layer of the adaxial/inner surface of the ovary.
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adaxial nucellar projection [PO:0008010; plant anatomy term ]
A portion of plant tissue that is the adaxial/upper portion of the nucellus overlying the vascular strands in the grass caryopsis.
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adaxial petiole canal [PO:0025239; plant anatomy term ]
A petiole canal on the adaxial surface of a petiole.
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adaxial protoderm [PO:0006083; plant anatomy term ]
A portion of protoderm (PO:0006210) tissue that is the outermost layer of the shoot apical meristem (PO:0020148), and gives rise to the leaf adaxial epidermis (PO:0006018).
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adult vascular leaf [PO:0006340; plant anatomy term ]
A vascular leaf characterized by particular anatomical traits namely, wax and trichome distribution, presence or absence of epidermal cell types, cell wall shape and biochemistry.
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adventitious root nodule [PO:0000040; plant anatomy term ]
Enlargement or swelling at position of dormant adventitious root primordium (on the stem), inhabited by nitrogen-fixing bacteria.
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adventitious shoot axis [PO:0025534; plant anatomy term ]
A shoot axis (PO:00025029) that develops in an unusual place.
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aerenchyma [PO:0005702; plant anatomy term ]
A portion of parenchyma tissue containing particularly large intercellular spaces of schizogenous or lysigenous origin.
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aerial tuber [PO:0004548; plant anatomy term ]
A shoot axis tuber (PO:0004543) that develops above ground.
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aerial tuber axillary bud meristem [PO:0025069; plant anatomy term ]
A tuber axillary bud meristem that is part of an aerial tuber.
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aerial tuber axillary shoot [PO:0025079; plant anatomy term ]
An axillary shoot that develops from an aerial tuber axillary bud.
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aerial tuber axillary vegetative bud [PO:0025041; plant anatomy term ]
A tuber axillary vegetative bud that is part of an aerial tuber.
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aerial tuber cortex [PO:0025056; plant anatomy term ]
A portion of tuber cortex that is part of an aerial tuber storage parenchyma.
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aerial tuber epidermis [PO:0025047; plant anatomy term ]
A portion of tuber epidermis that is part of an aerial tuber.
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aerial tuber interfascicular region [PO:0025051; plant anatomy term ]
A tuber interfascicular region that is part of an aerial tuber storage parenchyma.
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aerial tuber periderm [PO:0025044; plant anatomy term ]
A portion of tuber periderm that is part of an aerial tuber.
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aerial tuber perimedullary zone [PO:0025062; plant anatomy term ]
A tuber perimedullary zone that is part of an aerial tuber pith.
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aerial tuber pith [PO:0025054; plant anatomy term ]
A portion of tuber pith (PO:0025052) that is part of an aerial tuber storage parenchyma (PO:0025039).
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aerial tuber storage parenchyma [PO:0025039; plant anatomy term ]
A portion of tuber storage parenchyma (PO:0025036) that is part of an aerial tuber (PO:0004548).
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alar cell [PO:0030057; plant anatomy term ]
A native plant cell (PO:0025606) located at the base of a non-vascular leaf (PO:0025075) adjacent to where the leaf attaches to the stem (PO:0009047).
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albuminous cell [PO:0025412; plant anatomy term ]
A parenchyma cell (PO:0000074) that is morphologically and physiologically associated with a sieve cell (PO:0025415) but does is not derived from the same initial cell (PO:0004011) as the sieve cell.
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aleurone layer [PO:0005360; plant anatomy term ]
A portion of plant tissue that is the outermost layer of endosperm in a seed, its cells being characterized by presence of protein bodies containing seed storage proteins.
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amphithecium [PO:0030084; plant anatomy term ]
A portion of plant tissue that is the outer layer or layers of a sporangium early in sporangium development.
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androecium [PO:0009061; plant anatomy term ]
A collective phyllome structure (PO:0025023) composed all of the stamens (PO:0009029) in a flower (PO:0009046).
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androecium primordium [PO:0025478; plant anatomy term ]
A floral structure primordium (PO:0025477) that is committed to the development of an androecium (PO:0009061).
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anther [PO:0009066; plant anatomy term ]
A collective plant organ structure (PO:0025007) that is the pollen-bearing part of a stamen (PO:0009029).
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anther dehiscence zone [PO:0005011; plant anatomy term ]
A dehiscence zone that is part of an anther.
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anther locule [PO:0025264; plant anatomy term ]
A sporangium locule that is part of an anther and is a cavity within a single pollen sac or two or more fused pollen sacs.
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anther pore [PO:0025118; plant anatomy term ]
A plant anatomical space that is a pore at the apex of an anther.
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anther primordium [PO:0006089; plant anatomy term ]
A floral structure primordium (PO:0025477) that is committed to the development of an anther (PO:0009066).
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anther septum [PO:0005010; plant anatomy term ]
A septum that is present in an anther dehiscence zone.
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anther theca [PO:0009069; plant anatomy term ]
A collective plant organ structure (PO:0025007) that is part of an anther (PO:0009066) and consists of a pair of sporangia (PO:0025094) that dehisce down a common slit.
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anther vascular system [PO:0008013; plant anatomy term ]
A phyllome vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a anther.
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anther wall [PO:0000002; plant anatomy term ]
A microsporangium wall (PO:0025307) that is part of an anther (PO:0009066).
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anther wall endothecium [PO:0020002; plant anatomy term ]
An microsporangium endothecium (PO:0025309) that part of an anther wall (PO:0000002).
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anther wall exothecium [PO:0020004; plant anatomy term ]
An microsporangium exothecium that is part of an anther wall.
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anther wall inner secondary parietal cell layer [PO:0006008; plant anatomy term ]
An anther wall secondary parietal cell layer (PO:0006007) that is formed towards the inside, after the cells of an anther wall primary parietal cell layer (PO:0006006) undergo a periclinal division.
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anther wall middle layer [PO:0004700; plant anatomy term ]
A portion of ground tissue (PO:0025059) directly internal to an anther wall endothecium (PO:0020002) that develops from an anther wall secondary parietal cell layer (PO:0006007).
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anther wall outer secondary parietal cell layer [PO:0006009; plant anatomy term ]
An anther wall secondary parietal cell layer (PO:0006007) formed towards the outside, after an anther wall primary parietal cell layer (An anther wall secondary parietal cell layer (PO:0006006) undergoes a periclinal division.
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anther wall primary parietal cell layer [PO:0006006; plant anatomy term ]
A portion of ground tissue (PO:0025059) that is part of an anther wall (PO:0000002) and has as parts a primary parietal cell (PO:0006010) and adjacent plant cells.
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anther wall secondary parietal cell layer [PO:0006007; plant anatomy term ]
A portion of ground tissue (PO:0025059) that is part of an anther wall (PO:0000002) and develops from an anther wall primary parietal cell layer (PO:0006006).
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anther wall tapetum [PO:0009071; plant anatomy term ]
A microsporangium tapetum (PO:0025314) that is part of an anther wall (PO:0000002).
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anther wall tapetum cell [PO:0025545; plant anatomy term ]
A microsporangium tapetum cell (PO:0025544) that is part of the anther wall tapetum (PO:0009071).
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antheridiophore [PO:0030033; plant anatomy term ]
A stalk (PO:0025066) that supports an antheridium head (PO:0030075).
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antheridium [PO:0025125; plant anatomy term ]
A multicellular plant gametangium (PO:0025124) that produces antheridium sperm cells (PO:0025120) and has as parts an antheridium jacket layer (PO:0030053) and an antheridium stalk (PO:0030035).
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antheridium head [PO:0030075; plant anatomy term ]
A disk-shaped cardinal organ part (PO:0025001) that is the apical portion of an antheridiophore (PO:0030033) and bears antheridia (PO:0025125).
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antheridium jacket layer [PO:0030053; plant anatomy term ]
A portion of plant tissue (PO:0009007) that is a single layer of cells on the outside of an antheridium (PO:0025125).
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antheridium jacket layer cell [PO:0030052; plant anatomy term ]
A native plant cell (PO:0025606) that is part of an antheridium jacket layer (PO:0030053).
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antheridium microgametophyte [PO:0025283; plant anatomy term ]
A microgametophyte (PO:0025280) that has as parts one or more antheridia (PO:0025125).
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antheridium sperm cell [PO:0025120; plant anatomy term ]
A plant sperm cell (PO:0000084) which develops from a spermatogenous cell (PO:0025525) and is located in an antheridium (PO:0025125).
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antheridium stalk [PO:0030035; plant anatomy term ]
A stalk (PO:0025066) that is the basal part of an antheridium (PO:0025125).
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antipodal cell [PO:0020093; plant anatomy term ]
Cell, commonly three in number as in the eight-nucleate embryo sac, located at the other end of the embryo sac from the egg cell.
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antiraphe [PO:0020028; plant anatomy term ]
A cardinal organ part (PO:0025001) that is the part of a plant ovule (PO:0020003) on the opposite side from a raphe (PO:0020027).
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apical hook [PO:0000012; plant anatomy term ]
Hook-like structure which develops at the apical part of the hypocotyl in dark-grown seedlings in dicots.
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apical meristem [PO:0020144; plant anatomy term ]
A maximal portion of meristem tissue (PO:0009013) located at a shoot apex (PO:0000037) or root tip (PO:0000025).
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archegoniophore [PO:0030034; plant anatomy term ]
A stalk (PO:0025066) that supports an archegonium head (PO:0030034).
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archegonium [PO:0025126; plant anatomy term ]
A multicellular plant gametangium (PO:0025124) that develops from an archegonium initial cell (PO:0025510) and has as parts a venter (PO:0030038) and an archegonium neck (PO:0030039).
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archegonium central cell [PO:0025509; plant anatomy term ]
A native plant cell (PO:0025606) that is the larger, distal cell arising from the first division of an archegonium initial cell (PO:0025510).
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archegonium egg cell [PO:0025122; plant anatomy term ]
A plant egg cell (PO:0020094) that develops from the archegonium central cell (PO:0025509) and is located in the venter (PO:0030038).
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archegonium head [PO:0030076; plant anatomy term ]
An umbrella-shaped cardinal organ part that is the apical portion of an archegoniophore and bears archegonia.
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archegonium initial cell [PO:0025510; plant anatomy term ]
An initial cell (PO:0004011) that divides asymmetrically to form an archegonium central cell (PO:0025509) and a smaller archegonium neck canal cell (PO:0030035).
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archegonium megagametophyte [PO:0025282; plant anatomy term ]
A megagametophyte (PO:0025279) that has as parts one or more archegonia (PO:0025126).
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archegonium neck [PO:0030039; plant anatomy term ]
A cardinal organ part (PO:0025001) that is the elongated, apical part of an archegonium (PO:0025126).
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archegonium neck canal [PO:0030066; plant anatomy term ]
A canal (PO:0025132) in the center of an archegonium neck (PO:0030039).
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archegonium neck canal cell [PO:0030065; plant anatomy term ]
A native plant cell (PO:0025606) that is one of the axial row of cells in an immature archegonium neck (PO:0030039).
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archegonium stalk [PO:0030036; plant anatomy term ]
A stalk that the basal part of an archegonium.
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archesporial cell [PO:0030056; plant anatomy term ]
A native plant cell (PO:0025606) that divides to gives rise to a sporocyte (PO:0006204) and is part of a sporangium (PO:0025094).
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archesporium [PO:0030074; plant anatomy term ]
A portion of plant tissue (PO:0009007) that is the internal part of a sporangium (PO:0025094), bounded by the sporangium wall (PO:0025306), and has as parts archesporial cells (PO:0030056).
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areole bud [PO:0025353; plant anatomy term ]
An axillary vegetative bud (PO:0004712) that is not elongated, in which the vascular leaves (PO:0009025) develop as spine leaves (PO:0025173).
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aril [PO:0009090; plant anatomy term ]
An arilloid that is an outgrowth of a seed from a seed funicle.
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arillode [PO:0025378; plant anatomy term ]
An arilloid that is an elaborate outgrowth of a seed at the micropylar end.
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arilloid [PO:0019022; plant anatomy term ]
A cardinal part of multi-tissue plant structure (PO:0025498) that is a fleshy outgrowth of a seed (PO:0009010).
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articulated laticifer [PO:0005006; plant anatomy term ]
A portion of secretory tissue (PO:0005656) that has as parts articulated laticifer cells (PO:0006221).
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articulated laticifer cell [PO:0006221; plant anatomy term ]
A laticifer cell (PO:0025031) that is joined longitudinally to other articulated laticifer cells to form a tube.
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awn [PO:0025349; plant anatomy term ]
A cardinal organ part that is a slender, more or less straight and stiff, fine-pointed, terminal or subterminal appendage of a glume, lemma, or palea.
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axial secondary xylem parenchyma [PO:0004533; plant anatomy term ]
A portion of secondary xylem parenchyma (PO:0004532) that is part of an axial system (PO:0025410) and has as parts axial secondary xylem parenchyma cells (PO:0004526).
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axial secondary xylem parenchyma cell [PO:0004526; plant anatomy term ]
A secondary xylem parenchyma cell (PO:0004525) that is part of a portion of axial secondary xylem parenchyma (PO:0004533).
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axial system [PO:0025410; plant anatomy term ]
A portion of secondary vascular tissue (PO:0025409) that has as parts cells derived from fusiform initials (PO:0000079) and oriented with their longest diameter parallel to a plant axis (PO:0025004).
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axil [PO:0025224; plant anatomy term ]
A plant anatomical space that is the space between a shoot axis and a leaf, bract, or branch that branches from the shoot axis.
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axillary bud [PO:0004709; plant anatomy term ]
A bud (PO:0000055) that develops from an axillary bud meristem (PO:0000232).
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axillary bud meristem [PO:0000232; plant anatomy term ]
A shoot system meristem (PO:0006079) formed in an axil (PO:0025224).
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axillary flower bud [PO:0004710; plant anatomy term ]
An axillary bud that develops into a flower.
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axillary hair [PO:0025316; plant anatomy term ]
A multicellular trichome (PO:0025162) that has as parts a long terminal cell atop a basal stalk and grows in a leaf axil (PO:0009023).
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axillary hair basal cell [PO:0025319; plant anatomy term ]
A trichome cell (PO:0008030) that is part of a base of an axillary hair (PO:0025316).
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axillary hair base [PO:0025318; plant anatomy term ]
A portion of plant tissue that is the basal part of an axillary hair, below the axillary hair terminal cell.
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axillary hair terminal cell [PO:0025317; plant anatomy term ]
A trichome cell (PO:0008030) that is the long terminal cell of an axillary hair (PO:0008030).
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axillary inflorescence bud [PO:0004711; plant anatomy term ]
An axillary reproductive bud that develops into an inflorescence.
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axillary reproductive bud [PO:0025072; plant anatomy term ]
An axillary bud (PO:0004709) that develops into an reproductive shoot system (PO:0025082).
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axillary shoot system [PO:0006343; plant anatomy term ]
A shoot-borne shoot system (PO:0004545) that develops from an axillary bud (PO:0004709).
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axillary strobilus bud [PO:0025076; plant anatomy term ]
An axillary reproductive bud that develops into a strobilus.
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axillary vegetative bud [PO:0004712; plant anatomy term ]
An axillary bud (PO:0004712) that develops into a shoot system (PO:0009006) that has as organ parts only vegetative organs.
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