ABSTRACT
A dendrogram was constructed that utilized indices of genetic distance for all isolates tested in an isozyme characterization of Ascosphaerales. The Ascosphaerales clustered into three groups: (1) A. proliperda and A. atra, (2) mating types of A. apis, and (3) A. asterophora and A. major. Ascosphaera aggregata and Bettsia alvei did not cluster consistently with other isolates.