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Incompatibility Alleles of Typhula incarnata. G. W. Bruehl, Department of Plant Pathology, Washington State University, Pullman, WA 99164; R. Machtmes, Department of Plant Pathology, Washington State University, Pullman, WA 99164. Phytopathology 68:1311-1313. Accepted for publication 5 April 1978. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1311.

Most collections of Typhula incarnata, a tetrapolar species, produced viable basidiospores and vigorous monokaryons. Thirty-nine alleles of both the A and B loci were found in a sample of 32 field dikaryons. The multiplicity of incompatibility alleles precludes any information as to geographic races or of interbreeding within the species. We suspect that the sexual stage functions with frequency.