Microspore
Pronunciation : Mi"cro*spore
Part of Speech : n.
Etymology : [Micro- + spore.] (Bot.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913