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floral cup 2 (strict sense) |
= hypanthium (strict sense) |
STRUCTURE |
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A marginal protrusion from or enlargement of the receptacle (torus) of a flower, encircling and wholly, partly or not at all adnate to the gynoecium, bearing the perianth and androecium. |
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hypanthium 2 (strict sense) pl. hypanthia |
= floral cup (strict sense) |
STRUCTURE |
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A marginal protrusion from or enlargement of the receptacle (torus) of a flower, encircling and wholly, partly or not at all adnate to the gynoecium, bearing the perianth and androecium. |
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microspore |
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STRUCTURE |
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A male spore; a spore of the smaller of the two types produced by the sporophytes of a heterosporous taxon; produced in a microsporangium; giving rise upon germination to a microgametophyte. |
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sperm |
> antherozoid, spermatozoid |
STRUCTURE |
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A male gamete. |
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antheridium pl. antheridia |
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STRUCTURE |
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A male gametangium; a multicellular fertile organ of a mature gametophyte within which male gametes (antherozoids, spermatozoids) are produced and from which they are discharged, in some taxa forcibly, through a pore. Technically present but highly reduced and of no descriptive significance in Magnoliophyta and part of Pinophyta. |
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primary axis |
> ray |
STRUCTURE |
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A main or first-order axis within any specified, uniformly delimited structural context. |
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rachis 2 var. rhachis |
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STRUCTURE |
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A main or first-order axis of an inflorescence. |
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rachis 1 var. rhachis |
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STRUCTURE |
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A main or first-order axis of a compound leaf blade. |
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channel |
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FEATURE |
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A longitudinal, transversely rounded depression; esp. along the adaxial surface of a petiole or petiolule. |
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costule |
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STRUCTURE |
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A longitudinal primary vein in a diminutive laminar structure, such as the blade of a leaflet, pinna or pinnule; a diminutive costa (rib). |
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lateral vein |
>< costa, primary vein, rib; > secondary vein |
STRUCTURE |
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A longitudinal primary vein (costa, rib) that runs to one side of the midline, or a secondary vein that runs toward the lateral margin. See also tertiary vein, veinlet. |
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vallecula pl. valleculae |
= colpus, fossula, furrow, groove, sulcus |
STRUCTURE |
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A longitudinal depression that is relatively shallow and narrow; esp. in fruits of Apiaceae (Umbelliferae). |
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groove |
= colpus, fossula, furrow, sulcus, vallecula |
FEATURE |
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A longitudinal depression that is relatively shallow and narrow. |
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stoma 1 (broad sense) pl. stomata |
= stomatal apparatus, stomate |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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stomatal apparatus |
= stomate, stoma (broad sense) |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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stomate |
= stomatal apparatus, stoma (broad sense) |
STRUCTURE |
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A localized functional epidermal unit consisting of a microscopic pore and two encircling specialized cells, the guard cells, which, through changes of turgor pressure in response to environmental conditions, regulate the size of the pore and thus the rates of transpiration and gas exchange through it; the whole surrounded or not by associated, cytologically distinctive epidermal cells, the subsidiary or accessory cells, which, when present, are regularly oriented in relation to it. |
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scape |
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STRUCTURE |
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A leafless, essentially naked, inflorescence-bearing stem (or peduncle) arising directly from a caudex or rhizome, its point of insertion slightly beneath, at, or slightly above the substrate surface. |
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sporophyll |
= spore leaf; > fertile frond |
STRUCTURE |
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A leaf or homologous structure that bears sporangia. See also megasporophyll (macrosporophyll, not recommended), microsporophyll. |
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spore leaf |
= sporophyll; > fertile frond |
STRUCTURE |
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A leaf or homologous structure that bears sporangia See also megasporophyll (macrosporophyll, not recommended), microsporophyll. |
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frond |
< leaf, macrophyll (not recommended), megaphyll |
STRUCTURE |
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A leaf in Polypodiophyta or Palmae (Arecaceae), usually relatively large and often highly dissected. Use of this term in preference to "leaf" in descriptions of ferns and palms is a matter of tradition only, not of morphological or evolutionary distinction. |
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phyllodium pl. phyllodia |
= phyllode |
STRUCTURE |
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A leaf deemed to consist entirely or almost entirely of tissues evolutionarily derived from the petiole, all or a distal portion of which has become laminar, the original blade reduced to the point of absence or vestigiality. |
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phyllode |
= phyllodium |
STRUCTURE |
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A leaf deemed to consist entirely or almost entirely of tissues evolutionarily derived from the petiole, all or a distal portion of which has become expanded and blade-like, the original blade reduced to the point of absence or vestigiality. |
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crest |
= crista |
STRUCTURE |
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A laterally elongate, relatively thin, irregular or notched, apical protrusion. |
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crista pl. cristae |
= crest |
STRUCTURE |
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A laterally elongate, relatively thin, irregular or notched, apical protrusion. |
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column foot |
= mentum |
STRUCTURE |
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A lateral, often nectariferous protrusion from the proximal portion of a column, opposite the labellum, projecting in front of the rest of the flower; in Orchidaceae. |
