Three years after a large-scale fire in the Bohemian Switzerland National Park (Czech Republic), the rare species Obba rivulosa was found at three locations. Its basidiomata grew on burnt stumps of Picea abies and on a fallen, charred trunk of Pinus sylvestris. The macromorphological and micromorphological characters of the found basidiomata are briefly summarised. The obtained ITS barcode fits the European subpopulation, which may represent a cryptic species. Habitats of the finds are described and discussed in detail. The occurrence of O. rivulosa on burnt wood is reported in the literature, but its connection to this substrate may be stronger than previously expected. This is evidenced by the fact that during the long history of intensive research on polypores in the Czech Republic, the species had never been recorded, while it recently suddenly appeared at three burnt sites within one year.
Holec J., Vampola P., Zíbarová L., Tomšovský M. (2026): Rare polypore Obba rivulosa (Fungi, Basidiomycota) found for the first time in the Czech Republic – on charred wood after a big fire near Hřensko. – Czech Mycology 78(1): 23–37.
