We report the first Ukrainian records of Hermanssonia centrifuga (Meruliaceae) outside the Carpathian region. Traditionally, the species has been considered restricted to boreo-montane forest vegetation and climatic conditions. Its discovery in the plain part of the country highlights the recently reported fundamental change in the distribution pattern of the fungus. The importance of the records, ecology and taxonomy of the species are briefly discussed. We hypothesise that the species reached the northern part of Ukraine through the densely forested cross-border region of Polissia, and that the hemiboreal primeval woodlands of the Białowieża Forest (Belarus, Poland) represent the most likely dispersal centre.

Keywords: citizen science, distribution, new records, Phlebia s. l., Polissia, Polyporales, wood-inhabiting fungi

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