Tricholoma ustaloides (Agaricales, Basidiomycota) in Poland

The current distribution of Tricholoma ustaloides Romagn. in Poland is presented, based on literature data and the results of mycological investigations in oak-hornbeam forest associations in the Kotlina Raciborska basin. The paper reports the morphology of the discovered basidiomata, the habitat where they were found, and ITS sequence data for the specimens, and briefly discusses similar species and the ecology of the presented fungus. The location given in the paper is currently the only known station of T. ustaloides in Poland. The importance of secondary habitats for survival of this taxon is stressed.