Hypertext Webster Gateway: "Microspore"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Microspore \Mi"cro*spore\, 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}.
From WordNet (r) 1.7 (wn)
microspore
n : smaller of the two types of spore produced in heterosporous
plants; develops in the pollen sac into a male
gametophyte
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