Tricholoma borgsjoeense, a new species from a boreal coniferous forest in Fennoscandia

摘要

Tricholoma borgsjoeense, a species new to science, is described and illustrated. Its systematic position was investigated by use of ITS and LSU nuclear rDNA sequence data. The phylogenetic analysis indicates that the new species belongs in section Terrea and is closely related to the American species Tricholoma atroviolaceurn. Tricholoma is a large genus with at least 50 species known in Fennoscandia. All of them are ectomycorrhizal with various forest trees, and several well-known species occur in the boreal coniferous forests. However, in some sections of the genus, morphological differences are small and not always evident. One such section is Terrea Konrad &Maubl., which comprises a large number of rather similar taxa. This section is characterized by a dry, brownish or greyish, more or less scaly or tomentose pileus surface.