megasporangium pl. megasporangia |
= macrosporangium (not recommended) |
STRUCTURE |
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A sporangium that produces megaspores. |
antherozoid |
= spermatozoid; < sperm |
STRUCTURE |
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A motile male gamete, produced within an antheridium. |
barbella pl. barbellae |
= barbel |
STRUCTURE |
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A small barb. |
root 1 |
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STRUCTURE |
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Collectively, all those portions of a plant body that are anatomically distinct from the shoot, the component axes not differentiated into nodes and internodes, and branching endogenously. |
androecium pl. androecia |
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STRUCTURE |
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The stamen(s), staminode(s), if any, and their ontogenetically associated structure(s), if any, of a single flower, taken collectively. |
calyculus 1 pl. calyculi |
= epicalyx |
STRUCTURE |
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A whorl of bracts immediately subtending (beneath or outside) a calyx; literally, a little calyx. |
palea 1 pl. paleae, paleas |
= pale, palet, receptacular bract |
STRUCTURE |
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A small papery (chartaceous) to membranous bract borne on the compound receptacle (torus) of a capitulum (head) in Asteraceae (Compositae). |
branchlet |
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STRUCTURE |
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A branch of the highest or ultimate order. |
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. |
wall (fruit, ovary, pollen, spore) |
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STRUCTURE |
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The exterior layer of tissue(s) enclosing anatomically distinct interior tissues and sometimes fluid and/or one or more cavities. |
archegonium pl. archegonia |
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STRUCTURE |
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A female gametangium; a multicellular fertile organ of a mature gametophyte within which female gametes (eggs, ova) are produced and fertilized; having a broad, bulbous base and a narrower distal neck. Technically present but highly reduced and of no descriptive significance in Magnoliophyta. |
connective |
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STRUCTURE |
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The tissue between and joining the laterally opposed thecae of an anther, connecting them with the distal end of the staminal filament when the latter is present. |
dissepiment |
< septum; > replum |
STRUCTURE |
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A wall or partition between adjacent locules of an ovary or fruit. |
isthmus |
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STRUCTURE |
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A narrower portion connecting two wider or broader portions of an inclusive structure. |
spicule |
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STRUCTURE |
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A small, fine, stiff, acute protrusion that resembles a little spike. |
macrosporangium pl. macrosporangia (not recommended) |
= megasporangium |
STRUCTURE |
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A sporangium that produces megaspores. |
perigynium 1 pl. perigynia |
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STRUCTURE |
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Two whorls of bracts, scales or setae immediately subtending the ovary, sometimes cupulate (cup-shaped) or ampulliform (flask-shaped, lageniform) and investing the fruit (achene); in Cyperaceae. |
megaspore |
= macrospore (not recommended) |
STRUCTURE |
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A female spore; a spore of the larger of two types produced by the sporophytes of a heterosporous taxon; produced in a megasporangium; giving rise upon germination to a megagametophyte. |
stylopodium pl. stylopodia |
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STRUCTURE |
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A discoid enlargement at the base of the styles; esp. in Apiaceae (Umbelliferae). |
sapwood |
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STRUCTURE |
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That portion of the wood (xylem) of a stem or root whose cells are still living and functional; concentric about the heartwood once the latter has begun to form. |
paraphysis pl. paraphyses |
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STRUCTURE |
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An elongate, multicellular, sterile structure borne between sporangia within a sorus; in Polypodiophyta. |
ala 1 pl. alae |
= wing |
STRUCTURE |
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Any elongate, relatively thin protrusion or appendage. |
root 2 |
= radix |
STRUCTURE |
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A vascularized, primary or higher-order (branch) axis that is not differentiated into nodes and internodes and that branches endogenously, together with any non-axial structures borne from it; usually growing below ground level, but sometimes structurally and functionally specialized and growing wholly or partly aboveground (e.g. aerial root, knee root, pneumatophore). |
stipule |
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STRUCTURE |
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Any distinct, relatively diminutive, more or less foliaceous structure inserted on a stem alongside a petiole, or on a petiole near its base, and ontogenetically closely associated with the leaf; usually occurring as one of a pair disposed one to either side of the petiole. |
unguis pl. ungues |
= claw |
STRUCTURE |
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The abruptly much narrower proximal portion, when present, of a laminar structure, esp. a petal; of variable shape itself, but usually attenuate toward the base. |