Stalked rosette mushroom (Cotylidia undulata) on sandy roadside north from Lembolovo, 40 miles north from Saint Petersburg. Russia, September 9, 2017
Unnamed Road, Leningradskaya oblast', Russia, 188695Synonyms: Cantharellus fimbriatus, Craterella undulata, Hymenochaete undulata, Merulius undulatus, Podoscypha undulata, Stereum exiguum, Stereum tenerrimum, Stereum undulatum, Thelephora exigua, Thelephora undulata.
Common name: stalked rosette.
Russian name: Kotilidiya volnistaya.
Cotylidia undulata is a species of fungus that belongs to the family Rickenellaceae. It is characterized by its wavy to lobed cap, typically 1-4 cm in diameter, with a white to cream-colored surface and a decurrent gill attachment. In St. Petersburg, Leningrad Oblast, and north-western Russia, Cotylidia undulata has been found growing on mosses, peat, and other acidic substrates in coniferous forests, particularly in areas with high humidity and low nutrient availability. Fruitings typically occur from July to September.
Stalked rosette mushroom (Cotylidia undulata) on sandy roadside north from Lembolovo, 40 miles north from Saint Petersburg. Russia, September 9, 2017Unnamed Road, Leningradskaya oblast', Russia, 188695
Stalked rosette mushroom (Cotylidia undulata) on barren soil north from Lembolovo, 40 miles north from Saint Petersburg. Russia, September 9, 2017Unnamed Road, Leningradskaya oblast', Russia, 188695
Stalked rosette (Cotylidia undulata) together with a small omphalinoid mushroom Arrhenia rickenii(?) on a slightly mossy site of old fire near Kuzmolovo, north from Saint Petersburg. Russia, September 24, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Stalked rosette (Cotylidia undulata) together with a small umbilicate mushroom Arrhenia rickenii(?) on charred soil of old house fire near Kuzmolovo, north from Saint Petersburg. Russia, September 24, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663Observations of Cotylidia undulata in Leningrad Oblast and north-western Russia reveal its growth in various habitats. The fungus was found on sandy roadside and barren soil north of Lembolovo, approximately 40 miles north of Saint Petersburg. It also grew on slightly mossy sites near old fires, such as one near Kuzmolovo, where it co-occurred with Arrhenia rickenii. Additionally, Cotylidia undulata was observed on charred soil resulting from an old house fire in the same area. These observations suggest that the fungus can thrive in disturbed and burned areas, as well as on poor soils with limited vegetation. The presence of Cotylidia undulata in these habitats highlights its adaptability to different environments in north-western Russia. The fungus was observed in September, indicating a possible autumn fruiting period.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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