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Within a Gymnosperms, the microspore develops as the first cell to form the male gametophyte.

https://books.google.com/books?id=4dvyNckni8wC&pg=PA8&lpg=PA8&dq=microspore+function+in+Gymnosperms&source=bl&ots=VNbC91xOyZ&sig=teb0hepAW3iDNg0wlsb_q5I25xY&hl=en&sa=X&ved=0ahUKEwiY0_jO7P7SAhVJiVQKHTycCb4Q6AEIVTAK#v=onepage&q=microspore%20function%20in%20Gymnosperms&f=false

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.