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perisperm |
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STRUCTURE / SUBSTANCE |
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A genetically diploid (2n chromosomes) nutritive tissue in a seed; containing stored carbohydrate and/or oil utilized by the embryo prior to and especially upon germination; derived from the nucellus. See also endosperm (albumen). |
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crustaceous |
= crusty |
texture |
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Thin, dry, hard, and brittle. |
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proximal |
> basal |
position |
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Upon or associated with the portion of a structure closest to its developmental origin. |
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dorsifixed |
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fixation |
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Attached on the abaxial side well above the base. |
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ribbed 2 |
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solid shape |
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Having two or more prominent, elongate, relatively narrow, essentially parallel protrusions that extend over all or most of its length or circumference. |
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faceted |
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solid shape |
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Having numerous, relatively small, flat or shallowly curved portions of the external surface that are bounded by more or less distinct angular discontinuities in that surface. |
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furcate |
= forked; > bifurcate |
apex |
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Having two or more terminal, antrorse branches or divisions arising from a common point or level, like the prongs of a fork. |
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sporophyte |
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PLANT |
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The main, ultimate, spore-bearing stage in the diploid (2n chromosomes) phase of a taxon's life cycle. Two morphologically and genetically distinct and alternate phases together constitute the complete life cycle in sexually reproducing taxa, the other phase (gametophytic) being haploid (n chromosomes). Any taxon whose life cycle is confined to one or the other phase is limited to asexual means of reproduction, since sexual reproduction with consequent genetic recombination is impossible without alternation between haploid and diploid states via meiosis and fertilization. The term sporophytic applies to any part of the diploid phase, including all unicellular to multicellular entities belonging to it, whereas sporophyte is reserved for the principal and directly spore-producing stage of that phase. |
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succulent |
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texture |
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Herbaceous and juicy, often thickened (incrassate). |
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involute 1 |
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margin |
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Rolled adaxially. |
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trabecula pl. trabeculae |
< septum |
STRUCTURE |
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A transverse wall or partition that fully or partially separates two chambers within a sporangium. |
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ventricose |
= bellied |
solid shape |
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Bulging unilaterally near the middle, as though with a belly. |
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masculine |
= male |
reproduction |
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Of the sex that produces microspores and sperm. |
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bulb |
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STRUCTURE |
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A thickened underground perennating structure consisting of a stem with numerous closely proximate nodes bearing many tightly imbricate, thickened, often fleshy, foliaceous organs containing large amounts of stored food, usually in the form of starch; the whole usually enveloped and protected by imbricated scarious or fibrous foliaceous organs. |
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oblanceolate |
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plane shape |
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Inversely lanceolate (lancehead-shaped). |
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circumcaulous |
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position |
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Upon and surrounding the stem. |
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pouch-shaped |
= bag-shaped, saccate, sack-shaped |
solid shape |
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Irregularly obovoid with an exterior aspect intermediate between inflated and flaccid; like a closed pouch or bag. |
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disc 1 var. disk |
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STRUCTURE |
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Any distinct, annular to discoid structure produced from or borne upon a floral receptacle between or basal to any of the sets of floral organs; usually fleshy, often nectariferous. |
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repand |
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margin |
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Gently or shallowly sinuate. |
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erect |
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orientation |
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Perpendicular to the horizon or to the general plane of a bearing structure. |
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scutellate |
= platter-shaped, scutelliform |
solid shape |
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Relatively thin with opposite broad oval faces, shallowly concave-convex; like a serving platter. See also scutate (buckler-shaped, scutiform), which is not clearly distinct in its application. |
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spicule |
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STRUCTURE |
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A small, fine, stiff, acute protrusion that resembles a little spike. |
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hard-coated |
= corticate |
texture |
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Having a hard exterior layer and a distinct, softer interior. |
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inframedial |
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position |
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Slightly below the middle of the structure in point. |
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thallus 2 pl. thalli |
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STRUCTURE |
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The main body of a gametophyte, bearing rhizoids, gametangia (antheridia and/or archegonia), and/or gemmae cups; usually thin and more or less planate, inconspicuous, and growing appressed to or beneath the substrate surface; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. See also prothallus. |
