Abstract
Two litter decomposing agarics, Collybia subnuda and Marasmiellus praeacutus, were intensively sampled on permanent plots on a southern Appalachian mountain. Collybia subnuda is a dominant decomposer of deciduous tree detritus and M. praeacutus is a dominant decomposer of coniferous detritus. Tests of somatic incompatibility indicate that the observed population densities of C. subnuda and M. praeacutus are not less than 3.9-9.3 genets/100 m2 and 7.1-12.1 genets/100 m2, respectively. Self-crosses of single spore isolates obtained from both species indicate that C. subnuda has a bipolar mating system and M. praeacutus is tetrapolar. This is the first report of a bipolar mating system in the genus Collybia. Tests of somatic incompatibility between synthesized dikaryons and their parent progenitor indicate that somatic incompatibility tests can discriminate between closely related genets in some species but cannot in others.
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