Layers of microsproangium???
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microsporangium have 4 layers
tapitum
middle layer
endothelium
epidermis
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it has 4 layers
A microsporangium is circular in outline in transverse section and is usually surrounded by four wall layers. The outermost is the single layer of the epidermis. The second layer is endothecium, where cells develop thickenings. ... The innermost layer is tapetum, which provides nutrition to the developing pollen cells.
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