Microsporangium

microsporangia) is a sporangium that produces microspores that give rise to male gametophytes when they germinate.

Microsporocytes are produced in the microsporangia of gymnosperm cones and the anthers of angiosperms.

These become pollen grains, within which the microspores divide twice by mitosis to produce a very simple gametophyte.

[2]: 280 In angiosperms, a very young anther (the part of the stamen that contains the pollen) consists of actively dividing meristematic cells surrounded by a layer of epidermis.

Development of pollen sacs begins with the differentiation of archesporial cells in the hypodermal region below epidermis at four corners of the young anther.