microspore

English Thesaurus

1. smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte (noun.plant)

hypernym	:	spore,
definition	:	a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion (noun.plant)