Summary: Mutated and incompatibility factors of and ) were recovered from fruit bodies produced on common- and common- heterokaryons, respectively, following mutagenesis. The hyphal cells were either uninucleate or binucleate and had pseudo-clamps irregularly scattered along the hyphae. The hyphal cells were predominantly uninucleate and had no clamp structures. double mutants constructed from these and strains were predominantly binucleate, had true clamps, and gave rise to fertile fruit bodies indistinguishable from those of wild-type dikaryons. Although these strains resembled in most respects a normal dikaryon, they produced abundant oidiophores and oidia like the monokaryons. The oidia were uninucleate, and possessed the potential to grow into fertile homokaryons with the above characteristics.


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