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Pleomorphic fungi caused considerable confusion among mycologists and plant pathologists.To deal with pleomorphism, the dual nomenclature system was proposed, allowing different morphs of a fungus to have two different names.This became even more complicated when some fungi proved to be synanamorphic.In such cases a single biological species had more than two names and this rule caused a proliferation of fungal names.Connections between sexual and asexual morphs were previously chiefly based on co-occurrence on the same substrate.