How many pollen grains are produced by microspore mother cell?

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How many pollen grains are produced by microspore mother cell?
if i recall, a microspore mother cell undergoes meiosis to produce microspores, which in turn germinate.. undergo a few rounds of mitosis, and then lay dormant as gametophytic tissue, otherwise known as the pollen grain.





because each microspore as the potential to form a pollen grain, and 4 cells result from all progenitor cells undergoing meiosis (b/c there are 2 cell cleavage events), my best guess would be 4 pollen grains are produced per mother cell, albeit i don't specialize in plants.