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indusium pl. indusia |
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STRUCTURE |
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A protective membrane that is an outgrowth from the epidermis and covers a sorus during its maturation; in Polypodiophyta. |
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cell 1 |
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STRUCTURE |
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Any of the basic structural/functional units that collectively or individually make up the various tissues of a plant; comprising, at least while physiologically active, a nucleus with included genetic material (chromosomes), a surrounding cytoplasm with included organelles (e.g., ribosomes, mitochondria, plastids), an enclosing membrane, and an exterior cellulosic wall. |
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lamina 2 pl. laminae |
= ray |
STRUCTURE |
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The distal, relatively flat portion of the zygomorphic corolla of a ray floret, terminating in 0--4 teeth or lobes; in Asteraceae (Compositae). |
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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. |
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column 2 |
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STRUCTURE |
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A fused androecium (connate stamens) closely surrounding but free from the gynoecium; esp. in Malvaceae. |
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beak 2 |
= rostrum |
STRUCTURE |
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The inner, horn-like segment of a coronal lobe; esp. in Asclepiadaceae. |
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whorl |
= cycle, series, verticil |
STRUCTURE |
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A set of three or more lateral structures that are inserted around an axis at the same level. |
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plumule |
= epicotyl |
STRUCTURE |
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A distinguishable nascent shoot developed in the embryo in some taxa, consisting of a shoot axis with unexpanded internodes and one or more leaf primordia, being that portion of the embryo above the level of cotyledon insertion; the primordial shoot, when developed by the embryo within a seed; the first bud of a spermatophyte, when developed by an embryo within the seed. In other taxa the shoot is represented in the embryo only by a quiescent apical meristem at the summit of the embryonic axis. |
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tunic |
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STRUCTURE |
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A membranous covering outside the epidermis, especially around bulbs and corms, often becoming loose, sometimes scarious. |
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corolla tube 2 |
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STRUCTURE |
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The portion of the corolla of a bisexual or staminate disc floret proximal to the level of filament insertion; in Asteraceae (Compositae). |
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axis pl. axes |
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STRUCTURE |
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Any unitary and longitudinally continuous structure that bears laterally the subordinate portion(s), if any, of a plant root or shoot or any subdivision thereof and that represents the main line of structural development and/or symmetry distal to its origin, irrespective of the particular ontogenetic growth pattern involved. See also primary axis. |
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androecial tube |
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STRUCTURE |
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The tubular portion of an androecium in which the component structures have fused with one another laterally over part or all their lengths. |
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nucellus pl. nucelli |
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STRUCTURE |
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The distinct, genetically diploid tissue layer immediately surrounding the embryo sac of an ovule; often considered equivalent to a megasporangium wall. |
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palet 2 |
= pale, palea |
STRUCTURE |
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The upper or distal of the (usually) two distinctive bracts immediately subtending the flower in a grass (Poaceae) spikelet. |
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cucullus pl. cuculli |
= hood |
STRUCTURE |
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A cucullate (cuculliform) structure or component, esp. in an inflorescence or flower. |
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neck (archegonial) |
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STRUCTURE |
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The distal narrowed portion of an archegonium above its bulbous base. |
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bole |
= trunk; < main stem, primary stem |
STRUCTURE |
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The relatively stout, columnar, main stem of a distinct aboveground portion of a tree. |
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toothlet |
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STRUCTURE |
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A diminutive tooth (dens). See also sawtooth, sawtoothlet, scallop (crena), scalloplet (crenule). |
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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. |
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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. |
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hypogynium pl. hypogynia |
= gynophore; < stalk, stipe (broad sense, not recommended) |
STRUCTURE |
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The basal portion of an ovary when constricted and stalk-like above the level of perianth insertion, bearing the main body of the pistil at its summit; in Cyperaceae. |
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prickle |
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STRUCTURE |
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Any unvascularized spine-like enation originating in the epidermis, cortex, or mesophyll of any shoot part. See also spine, thorn. |
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carina 1 pl. carinae |
= keel |
STRUCTURE |
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An elongate, median longitudinal ridge that is basically triangular in transverse section and resembles the keel of a boat; esp. in leaf blades and sheaths, glumes, lemmata, paleae, sepals, petals. |
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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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climbing root |
< aerial root |
STRUCTURE |
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An aerial, usually adventitious root that, by some means, serves to anchor a climbing shoot portion to the structure(s) that support(s) it above ground level. |
