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megaphyll |
= leaf, macrophyll (not recommended); > frond, needle |
STRUCTURE |
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A principal, vegetative shoot organ borne laterally from a stem node; its vascular tissues, if any, continuous with those of the stem; undergoing no significant secondary growth; usually more or less bilaterally symmetrical; comprising a distal, usually laminar blade and/or a proximal stalk (petiole) or sheath; usually a primary site of photosynthesis. |
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megaphyllous |
= macrophyllous (not recommended) |
architecture |
plant |
Bearing megaphylls. |
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megasporangium pl. megasporangia |
= macrosporangium (not recommended) |
STRUCTURE |
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A sporangium that produces megaspores. |
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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. |
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megasporocarp |
= macrosporocarp (not recommended) |
STRUCTURE |
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A sporocarp that bears only megasporangia. |
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megasporophyll |
= macrosporophyll (not recommended); > carpel, cone scale, ovuliferous scale |
STRUCTURE |
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A sporophyll that bears only megasporangia and, in Pinophyta, naked ovules that develop subsequently. |
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megastrobilus pl. megastrobili |
= female cone, macrostrobilus (not recommended) |
STRUCTURE |
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A strobilus (cone) whose fertile organs are all megasporophylls. |
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membranaceous |
= membranous |
texture |
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Extremely thin, pliable, and fairly tough; like animal membrane. See also chartaceous (papery, papyraceous), pergamentaceous (parchment-like). |
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membrane |
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STRUCTURE |
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A relatively thin layer of tissue that covers or separates other, different tissue(s) and/or empty space(s). |
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membranous |
= membranaceous |
texture |
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Extremely thin, pliable, and fairly tough; like animal membrane. See also chartaceous (papery, papyraceous), pergamentaceous (parchment-like). |
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meniscoid |
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solid shape |
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Relatively thin with opposite, round, broad faces, one convex and one concave (as viewed externally), the circumferential edge angular or rounded; like a meniscus. See also discoid (disciform), lenticular (biconvex, lens-shaped), patelliform (kneecap-shaped). |
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mentum pl. menta |
= column foot |
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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mericarp |
= coccus |
STRUCTURE |
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One of the segments of a dehisced schizocarp; usually one-seeded and itself indehiscent. |
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…merous |
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architecture |
compound or compound-complex structure |
Having the number of equivalent component parts indicated by the prefix (e.g., petals in a corolla), or having different component sets of equivalent parts of that number in each set (e.g., calyx and corolla in a perianth); as in monomerous, oligomerous, polymerous, tetramerous, trimerous. |
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mesocarp |
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STRUCTURE |
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The middle tissue layer of the pericarp of a fruit. |
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mesochilium |
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STRUCTURE |
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The central portion of a labellum (lip) that has distinct proximal, distal, and central parts; in Orchidaceae. See also epichilium, hypochilium. |
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microgametophyte |
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PLANT |
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A gametophyte whose fertile organs (gametangia) are all antheridia. |
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microphyll |
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STRUCTURE |
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A small, lateral, leaf-like enation that, evolutionarily, is not a true leaf, i.e., whose vasculature, if any, consists of only a single median strand not ontogenetically integral with the vasculature of the bearing stem and not associated with leaf gaps in the stele of the stem; in Bryophyta, Psilotophyta, Lycopodiophyta, Equisetophyta. |
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microphyllous |
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architecture |
plant |
Bearing microphylls. |
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micropyle |
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FEATURE |
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The small pore in the integuments of an ovule at its apex, through which the pollen tube grows; or the corresponding aperture or scar in the coat of the seed that develops subsequently. |
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microsporangium pl. microsporangia |
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STRUCTURE |
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A sporangium that produces microspores. |
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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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microsporocarp |
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STRUCTURE |
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A sporocarp that bears only microsporangia. |
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microsporophyll |
> cone scale |
STRUCTURE |
|
A sporophyll that bears only microsporangia. |
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microstrobilus |
= male cone |
STRUCTURE |
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A strobilus (cone) whose fertile organs are all microsporophylls. |
