Glossary of Plant Anatomy

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tapetum [PO:0025313; plant anatomy term ]
A portion of ground tissue (PO:0025059) that is the inner-most layer of a sporangium wall (PO:0025306).
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tapetum cell [PO:0025543; plant anatomy term ]
A native plant cell (PO:0025606) that is part of the tapetum (PO:0025313).
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tassel apical meristem [PO:0006376; plant anatomy term ]
An inflorescence apical meristem that gives rise to the maize tassel.
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tassel floret [PO:0006310; plant anatomy term ]
A small staminate flower (PO:0025600) that is part of a tassel spikelet (PO:0006309).
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tassel inflorescence [PO:0020126; plant anatomy term ]
A staminate inflorescence (PO:0025601) in Zea species that bears the tassel spikelet (PO:0006309) on a terminal inflorescence axis (PO:0020122).
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tassel inflorescence branch [PO:0006323; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from an axillary bud (PO:0004709) on a first order inflorescence axis (PO:0025104) or from a higher order inflorescence branch that is part of a tassel inflorescence (PO:0020126).
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tassel inflorescence branch meristem [PO:0009107; plant anatomy term ]
An inflorescence branch meristem (PO:0009105) that gives rise to the long lateral tassel branch (PO:0009101), short tassel branch (PO:0009102), and tassel spikelets (PO:0006309) in a tassel inflorescence (PO:0020126).
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tassel meristem [PO:0009106; plant anatomy term ]
Meristem that gives rise to the apical and lateral structures of the tassel inflorescence in maize.
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tassel pedicellate spikelet [PO:0006312; plant anatomy term ]
Ultimate inflorescence branch of the maize tassel with a pedicel, developing from the spikelet pair meristem.
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tassel peduncle [PO:0006417; plant anatomy term ]
A peduncle of a maize tassel, below the lowest tassel node.
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tassel sessile spikelet [PO:0006311; plant anatomy term ]
Ultimate inflorescence branch of the maize tassel without a pedicel, developing from the spikelet pair meristem.
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tassel spikelet [PO:0006309; plant anatomy term ]
A spikelet (PO:0009051) that is part of the tassel inflorescence (PO:0020126) and bears tassel florets (PO:0006310) at maturity.
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tassel spikelet meristem [PO:0006377; plant anatomy term ]
Apical meristem that gives rise to the upper and lower florets of the maize tassel spikelets.
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tassel spikelet pair meristem [PO:0006358; plant anatomy term ]
The meristem present on short tassel branch that produces two spikelet meristems, each of which produces two floral meristems in a maize tassel.
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tassel spikelet rachilla [PO:0006379; plant anatomy term ]
The axis of the tassel spikelet, above the glumes.
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tegmen [PO:0020056; plant anatomy term ]
That part of the seed coat that develops from the inner integument.
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tension wood [PO:0025474; plant anatomy term ]
A portion of reaction wood (PO:0025472) found on the upper side of a shoot axis (PO:0025029) that is or was angled away from vertical and that has as parts gelatinous fiber cells (PO:0025422).
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tepal [PO:0009033; plant anatomy term ]
A phyllome (PO:0006001) that is part of a perianth (PO:0009058) where it is not possible to distinguish between the petals (PO:0009032) and sepals (PO:0009031).
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tepal abaxial epidermis [PO:0025192; plant anatomy term ]
A portion of tepal epidermis that covers the abaxial/lower surface of a tepal.
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tepal adaxial epidermis [PO:0025193; plant anatomy term ]
A portion of tepal epidermis that covers the adaxial/upper surface of a tepal.
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tepal apex [PO:0025143; plant anatomy term ]
A phyllome apex PO:0025139) that is part of a tepal (PO:0009033).
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tepal base [PO:0025148; plant anatomy term ]
A phyllome base (PO:0025140) that is part of a tepal (PO:0009033).
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tepal epidermis [PO:0025184; plant anatomy term ]
A portion of phyllome epidermis that is part of a tepal (PO:0009033).
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tepal margin [PO:0025015; plant anatomy term ]
The margin of a tepal (PO:0009033).
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tepal stomatal complex [PO:0025221; plant anatomy term ]
A phyllome stomatal complex that is part of a tepal (PO:0009033).
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tepal tip [PO:0025151; plant anatomy term ]
A phyllome tip that is part of a tepal apex.
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tepal trichome [PO:0025188; plant anatomy term ]
A phyllome trichome that is part of a tepal epidermis.
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tepal vascular system [PO:0025207; plant anatomy term ]
A phyllome vascular system (PO:0025206) that includes the totality of the portions of vascular tissue in their specific arrangement in a tepal (PO:0009033).
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terete vascular leaf [PO:0025334; plant anatomy term ]
A unifacial leaf that is round in cross section throughout all of part of the length of the leaf.
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terminal bud [PO:0004713; plant anatomy term ]
A bud that develops from a shoot apical meristem.
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terminal flower bud [PO:0004714; plant anatomy term ]
A terminal bud that develops into a flower.
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terminal inflorescence bud [PO:0004715; plant anatomy term ]
A terminal reproductive bud develops into an inflorescence.
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terminal reproductive bud [PO:0025071; plant anatomy term ]
A terminal bud that develops into a reproductive structure.
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terminal strobilus bud [PO:0025077; plant anatomy term ]
A terminal reproductive bud that develops into a strobilus.
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terminal vegetative bud [PO:0004716; plant anatomy term ]
A terminal bud (PO:0004713) that develops into a shoot system (PO:0009006) that has as organ parts only vegetative organs.
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tertiary leaf vein [PO:0008021; plant anatomy term ]
A leaf lamina vein (PO:0020138) arising from a secondary leaf vein (PO:0020140).
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testa [PO:0020057; plant anatomy term ]
That part of the seed coat that develops from the outer integument, or from the single integument when there is only one.
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tetrad of megaspores [PO:0025227; plant anatomy term ]
A portion of plant tissue consisting of four megaspores that remained joined together shortly after meiosis. One cell will give rise to a female gametophyte.
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tetrad of microspores [PO:0000032; plant anatomy term ]
A portion of plant tissue consisting of four microspores that remained joined together shortly after meiosis. Each cell will give rise to a male gametophyte.
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tetrarch protoxylem [PO:0025561; plant anatomy term ]
A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has four protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the plant axis (PO:0025004).
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thallus [PO:0030027; plant anatomy term ]
A whole plant in the gametophytic phase that has a flat growth form and no distinct organs.
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thallus meristematic apical cell [PO:0030025; plant anatomy term ]
A gametophyte apical cell that is part of a thallus.
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third order inflorescence branch [PO:0025105; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from a second order inflorescence branch (PO:0006322).
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third order infructescence branch [PO:0025114; plant anatomy term ]
An infructescence branch (PO:0025243) arising from a second order infructescence branch (PO:0025113).
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thorn [PO:0025172; plant anatomy term ]
A branch that is a sclerified, pointed outgrowth.
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tile cell [PO:0004530; plant anatomy term ]
Empty upright ray cell of approximately the same height as the procumbent ray cell and occurring in indeterminate horizontal series usually interspersed among the procumbent cells.
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tmema [PO:0030061; plant anatomy term ]
A portion of plant tissue (PO:0009007) that has as parts tmema cells (PO:0030059).
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tmema cell [PO:0030059; plant anatomy term ]
A native plant cell (PO:0025606) at the base of a gemma (PO:0025614) or adjacent to a brachycyte (PO:0030058) that breaks down to allow abscission of the gemma or brachycyte.
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tracheary element [PO:0000290; plant anatomy term ]
A native plant cell (PO:0025606) that has a lignified cell wall with secondary thickening and bordered pits.
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tracheid [PO:0000301; plant anatomy term ]
A tracheary element (PO:0000290) that has no perforations in its cell wall.
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tracheid bar [PO:0019026; plant anatomy term ]
A portion of xylem (PO:0005352) tissue that is a distinct ring-like structure composed of tracheids (PO:0000301), that is part of a seed (PO:0009010) and surrounds the hilum (PO:0020063) and forms a groove in the surface of the pericarp (PO:0009084) immediately adjacent to the hilum.
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transfer cell [PO:0000078; plant anatomy term ]
A cell with wall ingrowths (or invaginations) that increase the surface of the plasmalemma.
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transfer companion cell [PO:0025458; plant anatomy term ]
A companion cell (PO:0000400) that is a transfer cell (PO:0000078) with many cell wall invaginations.
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transition phyllode leaf [PO:0025336; plant anatomy term ]
A transition vascular leaf in which the basal portion of the leaf has unifacial lamina development in a median plane, similar to a phyllode, and the apical portion of the leaf develops leaflets similar to a juvenile leaf.
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transition vascular leaf [PO:0008018; plant anatomy term ]
A vascular leaf that is part of an heteroblastic series, and is characterized by anatomical features that are intermediate between juvenile and adult leaves.
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transition zone [PO:0003000; plant anatomy term ]
A region of the root between the meristem and the region of rapid elongation in which isodiametric growth (cell expansion) occurs.
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triarch protoxylem [PO:0025560; plant anatomy term ]
A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has three protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the plant axis (PO:0025004).
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trichoblast [PO:0000262; plant anatomy term ]
A root epidermal cell that is the smaller cell produced by the asymmetric division of an epidermal intial and gives rise to a root hair.
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trichome [PO:0000282; plant anatomy term ]
A unicellular or multicellular plant structure (PO:0009011) that forms a non-sclerified outgrowth from the epidermis (PO:0005679).
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trichome apex [PO:0025550; plant anatomy term ]
A plant structure (PO:0009011) that is the apical most portion of a trichome (PO:0000282).
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trichome cell [PO:0008030; plant anatomy term ]
A plant cell (PO:0009002) that is part of a multicellular trichome (PO:0000282).
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trichome tip [PO:0025549; plant anatomy term ]
A plant structure (PO:0009011) that is the apical most portion of a trichome apex (PO:0025550).
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tuber [PO:0025522; plant anatomy term ]
A plant axis (PO:0025004) that is radially enlarged.
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tuber axillary shoot [PO:0025003; plant anatomy term ]
An axillary shoot that develops from a tuber axillary bud.
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tuber cortex [PO:0025055; plant anatomy term ]
A portion of cortex (PO:0005708) that is part of a tuber storage parenchyma (PO:0025036).
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tuber interfascicular region [PO:0025050; plant anatomy term ]
An interfascicular region that is part of a tuber storage parenchyma.
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tuber perimedullary zone [PO:0025061; plant anatomy term ]
A perimedullary zone (PO:0025058) that is part of a tuber pith (PO:0025052).
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tuber pith [PO:0025052; plant anatomy term ]
A portion of pith (PO:0006109) that is part of a tuber storage parenchyma (PO:0025036).
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tuber storage parenchyma [PO:0025036; plant anatomy term ]
A portion of storage parenchyma (PO:0025035) that is part of a tuber (PO:0025522).
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tubercle [PO:0025352; plant anatomy term ]
An enlarged leaf base (PO:0020040) that is fused with adjacent shoot axis (PO:0025029) tissue.
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tuberous root [PO:0025523; plant anatomy term ]
A root (PO:0009005) that is radially enlarged relative to other lateral roots (PO:0020121) or shoot-borne roots (PO:0000042) on the same plant, but not as enlarged as a tuberous root tuber (PO:0025476).
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tuberous root tuber [PO:0025476; plant anatomy term ]
A tuber (PO:0004543) that develops from a tuberous root (PO:0025523) and is further radially enlarged.
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