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ABSTRACT
Dikaryons isolated from members of the genera Bovista, Calvatia, Langermannia, Lycoperdon, and Vascellum were aberrant in two respects. Trinucleate cells occurred in all isolates occasionally becoming dominant within sectors of the mycelium. Clamp connections were absent or developed sporadically. In isolates where trinucleate cells occurred at high frequency, tetranucleate cells were relatively numerous. Degeneration of a nucleus within a tetranucleate cell is held responsible for the development of the trinucleate condition. The same mechanism enables a trinucleate cell to revert to the binucleate state characteristic of the typical dikaryon.