Black mushrooms Biscogniauxia repanda on a fallen oak(?) tree near Lisiy Nos, south from Saint Petersburg. Russia, August 17, 2018Synonyms: Biscogniauxia pezizoides, Hypoxylon repandum, Nummularia pezizoides, Nummularia repanda, Nummularia repandoides, Nummulariella repanda, Numulariola repanda, Patellaria repanda, Sphaeria repanda.
Russian name: Biskoneziya raspustivshayasya.
Biscogniauxia repanda is a pyrenomycetous fungus that grows on dead wood, particularly deciduous trees. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found on various substrates, including birch, alder, and willow. The fungus produces stromata with perithecia, and its ascospores are dark brown to black, measuring 12-18 μm in length. It is considered a rare species in the region, with limited records of its occurrence, typically in old-growth forests or areas with rich deciduous tree cover.
Black mushrooms Biscogniauxia repanda on a fallen oak(?) tree near Lisiy Nos, south from Saint Petersburg. Russia, August 17, 2018
Black crust mushrooms Biscogniauxia repanda on a fallen oak(?) near Lisiy Nos, south from Saint Petersburg. Russia, August 17, 2018
Fungus Biscogniauxia repanda on a dry stem of hazelnut(?) in a hazelnut forest on a slope of Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Close-up of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) in a hazelnut forest on a slope of Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Fungus Biscogniauxia repanda on a dry stem of hazelnut(?) on Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Details of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) on Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Side view of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) in a hazelnut forest on a slope of Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Top view of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) in a hazelnut forest on a slope of Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Black formations of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) in a hazelnut forest on a slope of Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Upper surface of fungus Biscogniauxia repanda on a dry stem of hazelnut(?) on Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Fungus Biscogniauxia repanda on wood of hazelnut(?) on Orekhovaya Gora Hill in Duderhof Heights, south from Saint Petersburg. Russia, May 9, 2021
Crust mushroom Biscogniauxia repanda on rotting wood near a road west from Kavgolovskoe Lake (Syariunlakhti), near Toksovo. North from Saint Petersburg, Russia, July 26, 2024Observations of the fungus Biscogniauxia repanda in Leningrad Oblast and north-western Russia reveal its presence on various substrates. It was found on a fallen oak tree near Lisiy Nos, south of Saint Petersburg, in August 2018. In May 2021, it was observed on dry stems of hazelnut in a hazelnut forest on Orekhovaya Gora Hill in Duderhof Heights, with multiple views showcasing its black crust-like formations. The fungus was also spotted on rotting wood near Kavgolovskoe Lake, near Toksovo, north of Saint Petersburg, in July 2024. These observations suggest that Biscogniauxia repanda is a saprotrophic fungus that can thrive on dead wood, including oak and hazelnut, in various locations within the region. Its black, crust-like appearance was consistently noted across different observations.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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