SUMMARY: Induction of oospore formation by the complementary strain occurred in both cases when A and A isolates of were separated by polycarbonate membranes and up to 3 mm of agarose. The number of oospores produced increased as separation distance decreased. The homothallic species induced oospore formation in both the A and A isolates of var. stimulated oospore formation in the A but not the A isolate of , while and stimulated the A but not the A isolate. Sexual reproduction of homothallic species of may thus also be controlled by α hormones. Sixteen types of chemically regulated sexuality among the members of , differing in hormone production and responsiveness to hormones, are postulated.


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