Category: M
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Modified
Changed in shape or function.
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Mm
Millimetre, 1/10th of a centimetre.
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Mitriform
Cap-shaped and ending in a point, as in the mitre of a bishop. Shaped like the mitered cap worn by bishops during Catholic religious ceremonies; that is, swollen in the middle, tapered at the top sharply, but only somewhat tapered below, and with flattened (truncate) end with a broad germ pore.
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Misapplied
(In nomenclature) name applied to a taxon that does not include the type of that name.
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Minute
Very small. At the lower end of the range of sizes that can be seen with the naked eye.
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Mineralised
Of organic material impregnated with mineral.
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Midrib
The main vascular supply and support structure of a simple leaf-blade or leaflet, a continuation of the petiole, running the full length of the leaf. The main rib or longitudinal vein (an externally visible vascular bundle) of a leaf or leaflet. Central, major vein in a leaf, bract, petal, or sepal. The main central vein…
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Microsporophyll
A specialised leaf bearing only microsporangia. A leaflike organ bearing one or more microsporangia.
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Microsporocarp
The growth form from which the microsporangia of Azolla are produced.
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Microspore
The smaller-sized spores in heterosporous plants (as opposed to megaspores), the spores that produces male gametes. A small spore that germinates to form a male gametophyte.