Tricholomopsis in Europe - phylogeny, key, and notes on variability

Tricholomopsis (Basidiomycota, Agaricales) species in Europe were studied by classical and molecular methods (morphology, anatomy; sequences of nuclear rDNA containing ITS1, ITS2, 5.8S and part of 28S regions). The identity of four species was confirmed: T. rutilans, T. flammula, T. decora, T. osiliensis. Within T. flammula, two well-supported groups were recovered. An identification key based on a better understanding of the species limits was prepared. All species are briefly characterized and their variability is discussed. Tricholomopsis ornata should be rejected; it is considered a doubtful, poorly documented taxon, and the name has been variously interpreted.