|1.||Compare megaspore the smaller of two types of spore produced by some spore-bearing plants, which develops into the male gametophyte|
|2.||the pollen grain of seed plants|
|microspore (mīk'rə-spôr') Pronunciation Key
One of the two types of haploid spores produced by a heterosporous plant. Microspores develop into male gametophytes and are usually smaller than megaspores. In angiosperms, the microspore develops into the pollen grain.