microspore: smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte
spore: 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
lip: either the outer margin or the inner margin of the aperture of a gastropod's shell