Coltricia confluens is a species of fungus that belongs to the family Hymenochaetaceae. It is characterized by its brown to greyish-brown cap, 2-6 cm in diameter, with a velvety to felted surface, and a stipe of similar color, 1-3 cm long and 0.5-1.5 cm thick. In St. Petersburg, Leningrad Oblast, and north-western Russia, Coltricia confluens has been found growing on the ground in coniferous and mixed forests, typically associated with spruce, pine, and birch trees. It fruits from July to October, with a peak in August and September. The fungus is considered rare in the region, but can be locally common in suitable habitats.
Observations of the fungus Coltricia confluens in Leningrad Oblast and north-western Russia revealed its presence on burnt ground and bonfire sites. On July 25, 2017, it was found on a bonfire site along a road near Kavgolovskoe Lake. Similar findings were made on August 9, 2017, on burnt ground in the same area, with a closer look at the pores of the fungus. On August 25, 2017, it was spotted on an old bonfire site and burnt ground in a forest on the west side of Kavgolovskoe Lake. The fungus was also observed growing on burnt ground in the same forest, suggesting a possible preference for disturbed or burned areas. The observations took place near Toksovo, north from Saint Petersburg, Russia. The identifications were mostly tentative, with some uncertainty between Coltricia confluens and C. perennis.
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