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SUMMARY
In the heterothallic ascomycete C. radicicola two compatibility groups, A and a, occur. Thalli that belong to one compatibility group or another are hermaphroditic, self-sterile, and cross-fertile. However, heterokaryosis was recognized in the black strain from which thalli of types A and a were isolated. A brown strain of C. radicicola produced brown perithecia when crossed with the compatible black strains. Ascospores from this cross gave rise to black and brown strains in 1:1 ratio.