Pollen is also produced by meiosis in the male anther (microsporangium). A pollen grain develops from a microspore in the microsporangium and contains the male gametophyte. Male spores (microspores) are extremely small and are produced inside each microsporangium. Each microsporangium contains diploid microspore mother cells, or microsporocytes. In parallel to these developments, the other kind of sporangium, the microsporangium, produces microspores.