| microspore | <plant biology> A haploid spore produced by a plant sporophyte that develops into a male gametophyte. In seed plants, it corresponds to the developing pollen grain at the uninucleate stage. The smaller of the spores of a heterosporous species. (18 Nov 1997) |
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| microsporea | A class of parasitic protozoa. Characteristics include spores that are spherical, oval, or tubular in shape and sporoplasm which is uninuclear or binuclear. (12 Dec 1998) |