1. Noun
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.
2. Noun
smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte
Vocabulary classified under Nature and environment
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