Brown and pale buff-brown caps of brittlestem mushrooms Psathyrella corrugis on wood chips in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017Synonyms: Agaricus caudatus, Agaricus corrugis, Agaricus cuspidatus, Agaricus gracilis, Coprinarius caudatus, Coprinarius corrugis, Coprinarius gracilis, Drosophila caudata, Drosophila corrugis, Drosophila gracilis, Drosophila polycystis, Hypholoma gracile, Pilosace corrugis, Prunulus gracilis, Psathyra corrugis, Psathyra gracilis, Psathyrella atrolaminata, Psathyrella caudata, Psathyrella gracilis, Psathyrella polycystis.
Common name: red edge brittlestem.
Russian names: Psatirella morshchinistaya, Khruplyanka morshchinistaya.
Psathyrella corrugis is a species of fungus that belongs to the family Psathyrellaceae. It has been found in St. Petersburg, Leningrad Oblast, and other parts of north-western Russia, typically growing on rich soil, compost, and decaying organic matter. The fungus produces small to medium-sized fruiting bodies with bell-shaped caps that are 1-3 cm in diameter, featuring a corrugated or wrinkled surface, and gills that are crowded and attached to the stem. The spores are brownish-purple and ellipsoidal in shape. In north-western Russia, Psathyrella corrugis tends to fruit from summer to autumn, often in urban and suburban areas with abundant organic waste.
Brown and pale buff-brown caps of brittlestem mushrooms Psathyrella corrugis on wood chips in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Brittlestem mushrooms Psathyrella corrugis on wood chips in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Fading caps of brittlestem mushrooms Psathyrella corrugis on a lawn in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Young brittlestem mushrooms Psathyrella corrugis on a lawn in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Brittlestem mushrooms Psathyrella corrugis on mulch in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Brittlestem mushrooms Psathyrella corrugis on mulch, on a lawn in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
Brittlestem mushrooms Psathyrella corrugis(?) on mulch near railroad in Lembolovo, north from Saint Petersburg. Russia, September 20, 2017
Red edge brittlestem mushrooms (Psathyrella corrugis) on a forest trail in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, October 6, 2025
White, slender, fragile stems of brittlestem mushrooms Psathyrella corrugis on a forest trail in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, October 6, 2025
Greyish-brown gills with a pale edge (fimbriate) of brittlestem mushrooms (Psathyrella corrugis) on a forest trail in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, October 6, 2025
Close-up of gills and a base of a stem of brittlestem mushrooms (Psathyrella corrugis) on a forest trail in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, October 6, 2025Observations of Psathyrella corrugis in Leningrad Oblast and north-western Russia revealed various growth patterns. The fungus was found growing on wood chips, lawns, and mulch in the Botanic Gardens of Komarov Botanical Institute, Saint Petersburg, with brown and pale buff-brown caps. Young mushrooms were observed on lawns, while fading caps were seen on established growths. Mulch also supported growth, both on lawns and independently. Additionally, similar species were spotted near a railroad in Lembolovo, north of Saint Petersburg, on mulch. The fungus appeared to thrive in diverse environments, from controlled gardens to natural areas, suggesting adaptability. These observations highlight the presence and varying growth habits of Psathyrella corrugis in the region. The fungus's ability to grow on different substrates and in various locations was consistently noted throughout the observations.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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