SUMMARY: Thirty-three collections of from nature and several strains of cultivated were compared by 16 criteria including type of sexuality, interfertility patterns, macroscopic and microscopic morphology, growth and cultural characteristics, production of extracellular enzymes, and isoenzyme patterns for one enzyme. All but three of the collections fell into six distinct groups as defined with respect to all criteria examined. Members within each group are clearly related, but relationships between groups could not be established. Sexuality and interfertility patterns are important criteria for distinguishing relatedness among the collections. The correlations observed provide a new and useful base of reference for the classification of members of the genus Several aspects of the basic biology of the genus have also been revealed.


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