n. [ Micro- + spore. ] (Bot.) One of the exceedingly minute spores found in certain flowerless plants, as Selaginella and Isoetes, which bear two kinds of spores, one very much smaller than the other. Cf. Macrospore. [ 1913 Webster ]
Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Microspore \Mi"cro*spore\ (m[imac]"kr[-o]*sp[=o]r), n. [Micro- +
spore.] (Bot.)
One of the exceedingly minute spores found in certain
flowerless plants, as {Selaginella} and {Isoetes}, which bear
two kinds of spores, one very much smaller than the other.
Cf. {Macrospore}.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
microspore
n 1: smaller of the two types of spore produced in heterosporous
plants; develops in the pollen sac into a male gametophyte
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