Contributions of mating studies to mushroom systematics

Three general topics are included. First, a summary of knowledge of mating systems in several genera is furnished, with discussion concerning individual species. Second, the consequence of mating studies in expansion or contraction of numbers of accepted names is discussed. Inherent in this topic is the species concept to be used by the systematis. Third, guidelines for establishment of standard batteries of tester strains are outlined, using Pleurotus as an example.