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At the same time, microsporangium wall often disappeared or retained insignificant vestige for the disintegration of the tapetum leaving only epidermis and fibrous layers (Fig.
In non-flowering plants, pollen is transferred from a microsporangium to an ovule.
2c-g, 3g) and the base of each microsporangium becomes papillose (Fig.
Because so many meiotic events occur in the microsporangium and because each sporangium contains only microspores or megaspores, recombination would be possible among gametangia produced by the same plant.
They are located in the different cell layers of the microsporangium and have various functions that contribute to the formation of the functional male gametophyte.