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ABSTRACT
Genetic variation and its distribution among populations and putative species of 70 isolates in the genus Basidiobolus were analyzed by means of electrophoretic analysis of soluble enzymes. Five enzyme systems were examined and showed large variation. Among laboratory isolates, only one of B. microspore could be distinguished by means of cluster analysis. Patterns of variation among natural isolates revealed little differentiation with respect to host (toad vs lizard), but very strong patterns of geographical differentiation. Furthermore, natural isolates were quite distinct from laboratory strains tested. These results suggest that the genus Basidiobolus is genetically very heterogeneous, and this fact may contribute to difficulties encountered in defining taxonomic relationships.