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RE: Mushrooms can have 4,000+ different sexes
I guess I explained how the got so many mating types without even touching the reason why. And to be honest I have not really read anything about why they have this complex system. However, my first thought would be that they do not use the sex in a strict way like we do. For them it does not matter which mating type they create an offspring with, and that the mating types instead act as a regulator to prevent it from mating with the exact same type (so it will not fertilize another part of itself).
Ah ok like sex differentiation for the sake of variety and plurality amongst the species.