Xanthoporia radiata (Mensularia radiata)(?) mushroom on a rotten log near Lisiy Nos, west from Saint Petersburg. Russia, September 12, 2016Synonyms: Boletus radiatus, Fomes radiatus, Fomes variegatus, Inoderma radiatum, Inodermus radiatus, Inonotus radiatus, Mensularia radiata, Microporus aureonitens, Microporus radiatus, Ochroporus radiatus, Polyporus aureonitens, Polyporus coffeaceus, Polyporus cucullatus, Polyporus radiatus, Polystictus aureonitens, Polystictus radiatus, Polystictus scrobiculatus, Trametes radiata, Xanthochrous aureonitens, Xanthochrous radiatus.
Common name: alder bracket.
Russian name: Trutovik luchistyy.
Xanthoporia radiata is a rare fungus species in the family Hymenochaetaceae, characterized by its bright yellow to orange-yellow cap with radial striations. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found growing on stumps, logs, and dead wood of coniferous trees, particularly spruce and pine, in moist, shaded areas. The fungus typically fruits from July to October, producing sessile or substipitate fruiting bodies with a smooth, wavy, or lobed margin. It is considered a rare and locally endangered species in the region due to habitat loss and degradation.
Xanthoporia radiata (Mensularia radiata)(?) mushroom on a rotten log near Lisiy Nos, west from Saint Petersburg. Russia, September 12, 2016
Xanthoporia radiata (Mensularia radiata) mushrooms near Lisiy Nos, west from Saint Petersburg. Russia, February 18, 2017
Xanthoporia radiata (Mensularia radiata) mushrooms with mold near Lisiy Nos, west from Saint Petersburg. Russia, March 3, 2017
Xanthoporia radiata (Mensularia radiata) mushrooms on a tree near Lisiy Nos, west from Saint Petersburg. Russia, March 3, 2017
Old Xanthoporia radiata (Mensularia radiata) mushrooms on a tree in Sosnovka Park. Saint Petersburg, Russia, March 13, 2017
Rotten blackened Xanthoporia radiata (Mensularia radiata) mushrooms on a tree in Sosnovka Park. Saint Petersburg, Russia, March 13, 2017
Poroid crust mushroom Xanthoporia radiata (Mensularia radiata) on a dry branch of hazelnut in Orekhovo, 40 miles north from Saint Petersburg. Russia, March 18, 2017
Poroid crust fungus Xanthoporia radiata (Mensularia radiata) on a dry branch of hazelnut in Orekhovo, 40 miles north from Saint Petersburg. Russia, March 18, 2017
Close up of poroid crust fungus Xanthoporia radiata (Mensularia radiata) on a dry branch of hazelnut in Orekhovo, 40 miles north from Saint Petersburg. Russia, March 18, 2017
Poroid crust fungus Xanthoporia radiata (Mensularia radiata) taken from a hazelnut branch in Orekhovo, 40 miles north from Saint Petersburg. Russia, March 18, 2017
Poroid fungus Xanthoporia radiata (Mensularia radiata) on alder in area of Blizhnie Dubki near Lisiy Nos, west from Saint Petersburg. Russia, April 7, 2017
Alder bracket mushrooms (Xanthoporia radiata)(?) in Blizhnie Dubki area near Lisiy Nos, west from Saint Petersburg. Russia, September 11, 2017
Alder bracket mushrooms (Xanthoporia radiata)(?) on a log in Blizhnie Dubki area near Lisiy Nos, west from Saint Petersburg. Russia, September 11, 2017
Alder bracket mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Young alder bracket mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Caps of alder bracket mushrooms (Xanthoporia radiata) exuding water drops in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Guttation of alder bracket polypore mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Water drops, or guttation of young alder bracket polypore mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Masses of alder bracket polypore mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Cluster of alder bracket polypore mushrooms (Xanthoporia radiata) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017
Xanthoporia radiata (Mensularia radiata) mushrooms on an alder(?) stump near Lisiy Nos, west from Saint Petersburg. Russia, September 1, 2018Xanthoporia radiata was observed in various locations in Leningrad Oblast and north-western Russia, including near Lisiy Nos, Sosnovka Park, Orekhovo, and Blizhnie Dubki. The fungus was found growing on rotten logs, trees, dry branches of hazelnut, and alder stumps. Observations were made throughout the year, with notable sightings in September 2016, February and March 2017, and September 2017 and 2018. The fungus was seen in different stages, including young and old specimens, some with mold or blackened due to rot. Some observations highlighted unique features such as guttation, where water drops were exuded from the caps of the mushrooms. The fungus was often found in clusters or masses, particularly in forests along the gulf. Overall, Xanthoporia radiata appears to be a common and widespread species in this region.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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