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ABSTRACT
Monosporous isolates were obtained from spore prints of 43 collections of the Collybia dryophila complex occuring in North America. Intercrosses among testers from different sources reveal four intersterile populations (biological species) in North America. Mating within each group is determined by a tetrapolar incompatibility system with multiple alleles at the mating loci. These four biological species correspond to distinct taxa. North American populations of Collybia dryophila are widely distributed and occur on a variety of substrates. Collybia subsulphurea and C. earleae represent distinct species which fruit early in the season. A fourth species, Collybia brunneola, is described as new. A description of each taxon, illustrations and a key are provided.