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The Number and Distribution of Incompatibility Alleles in Laccaria laccata var. moelleri (Agaricales). R. L. Doudrick, Department of Forest Resources, University of Minnesota, St. Paul 55108; G. R. Furnier, and N. A. Anderson. Departments of Forest Resources and Plant Biology, and Departments of Plant Pathology and Forest Resources, respectively, University of Minnesota, St. Paul 55108. Phytopathology 80:869-872. Accepted for publication 27 March 1990. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1990. DOI: 10.1094/Phyto-80-869.

Sporocarps of the ectomycorrhizal fungus Laccaria laccata var. moelleri were collected in association with black spruce on peatlands in northern Minnesota and central Canada. Pairings between homokaryotic mating-type reference cultures obtained from the sporocarps indicated an absence of any heterogenic incompatibility barriers. The number of homogenic incompatibility alleles in the species was estimated to be 17 at the A locus and 18 at the B locus. These estimates are much lower than those reported for other basidiomycetes. Outbreeding efficiency was estimated to be 88.6%.