Structure of microsporangium:-

• A typical microsporangium appears near circular in outline.
• It is generally surrounded by four wall layers: the epidermis, the endothecium, the middle layers, and the tapetum.
• The outer three layers perform the function of protection and help in dehiscence of the anther to release the pollen.
• The tapetum (innermost layer) nourishes the developing pollen grains. Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
• When the anther is young, a group of compactly arranged homogenous cells (sporogenous tissue) occupies the center of each microsporangium.
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