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ABSTRACT
Studies on four isolates of Stemonitis flavogenita indicate that nonheterothallism (presumptive apomixis) may be typical for the species, but heterothallism has been demonstrated in one isolate, CR 1. The heterothallic condition was derived in the laboratory from a specimen which was apomictic. Possible mechanisms of the interconvertibility between heterothallism and apomixis are presented, and the evolutionary significance of the two life cycle modes in a single morphospecies is discussed.