In heterosporous plants, a sporangium that produces microspores.Usually morphologically distinct from the megasporangium. Generally, large numbers of microspores are produced.
The sporangium from which the microspores are formed, which in higher plants is the pollen sac.
(pl. microsporangia) The male sporangium in which microspores are developed.
the smaller of the two kinds of sporangia produced in the sexual life cycle of a heterosporous plant.
The sporangium in which microspores are produced.