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Abstract
Mycorrhizal members of the Cortinariaceae are an important component of the mycoflora of aspen (Populus tremuloides) stands in Montana. Fourteen species of Inocybe that occur with aspen in Montana are described. A majority of the species were linked for the first time with aspen in North America, and this is the first report of I. flavella, I. longispora, and I. squamata from North America. Inocybe species are generally thought to be rather unspecific as to host with a preference for disturbed or early successional sites. The occurrence of many of the same species in widely distributed aspen stands in Montana and Idaho, suggests aspen may host a limited set of Inocybe species within this region. More extensive surveys are needed to determine if a pattern does indeed exist, and how host tree, soil, climate, and geography influence the distribution of Inocybe species.