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Within a Gymnosperms, the microspore develops as the first cell to form the male gametophyte.
LANG, G., 1994: Quartäre Vegetationsgeschichte Europas. Gustav Fischer Verlag Jena, Stuttgart, New York: 462 S.
http://www.botany.unibe.ch/paleo/pollen_e/morphology.htm
tetragonally formed bilateral microspores
tetrahedrally formed isodiametric microspores
Morphology of Microspores
The microspore consists of three different walled layers. The outer layer is called the perispore, the next is the exospore, and the inner layer is the endospore. The perispore is the thickest of the three layers while the exospore and endospore are relatively equal in width.