Whitelaced shank mushroom (Megacollybia platyphylla) in a forest around Kavgolovskoe Lake, near Saint Petersburg. Russia, September 6, 2013Synonyms: Agaricus grammocephalus, Agaricus platyphyllus, Agaricus repens, Agaricus subulatus, Agaricus tenuiceps, Clitocybula platyphylla, Collybia grammocephala, Collybia platyphylla, Collybia repens, Collybia spuria, Gymnopus platyphyllus, Hydropus platyphyllus, Oudemansiella platyphylla, Tricholoma tenuiceps, Tricholomopsis platyphylla.
Common name: whitelaced shank.
Russian names: Megakollibiya shirokoplastinchataya, Kollibiya shirokoplastinchataya, Megakollibiya shirokoplastinkovaya, Udemansiella shirokoplastinkovaya, Denezhka shirokoplastinchataya.
Megacollybia platyphylla is a species of fungus that grows in clusters on decaying wood, particularly conifer logs. In St. Petersburg, Leningrad Oblast, and north-western Russia, it typically fruits from June to October. The cap is 4-12 cm broad, fan-shaped to semicircular, and grayish-brown with a wavy margin. The stipe is 3-8 cm long and 1-3 cm thick, often curved and tapered at the base. It has been found in urban parks, forests, and along rivers, including the Neva River, where it grows on submerged or partially submerged wood.
Whitelaced shank mushroom (Megacollybia platyphylla) in a forest around Kavgolovskoe Lake, near Saint Petersburg. Russia, September 6, 2013
Whitelaced shank mushroom (Megacollybia platyphylla) near Kavgolovskoe Lake in Toksovo, north from Saint Petersburg. Russia, August 2, 2016
Whitelaced shank mushroom (Megacollybia platyphylla). Oselki, south from Saint Petersburg, Russia, August 29, 2016
Whitelaced shank mushroom (Megacollybia platyphylla) near Lisiy Nos, south from Saint Petersburg. Russia, September 3, 2016
Whitelaced shank mushrooms (Megacollybia platyphylla) near a rotten log south-west from Dibuny - Pesochnyi, near Saint Petersburg. Russia, September 14, 2016
Whitelaced shank mushrooms (Megacollybia platyphylla) south-west from Dibuny - Pesochnyi, near Saint Petersburg. Russia, September 14, 2016
Whitelaced shank mushroom (Megacollybia platyphylla) in Lembolovo, 40 miles north from Saint Petersburg. Russia, July 5, 2017
Whitelaced shank mushrooms (Megacollybia platyphylla) in Yuntolovsky Park. Saint Petersburg, Russia, July 7, 2017
Large whitelaced shank mushroom (Megacollybia platyphylla)(?) on a rotten birch near Lisiy Nos, west from Saint Petersburg. Russia, July 18, 2017
Large whitelaced shank mushroom (Megacollybia platyphylla) in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
Gills of a large whitelaced shank mushroom (Megacollybia platyphylla) in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
Whitelaced shank mushrooms (Megacollybia platyphylla) in Lembolovo, 35 miles north from Saint Petersburg. Russia, August 8, 2017
Whitelaced shank mushrooms (Megacollybia platyphylla) near a stump in Lembolovo, 35 miles north from Saint Petersburg. Russia, August 8, 2017
Whitelaced shank mushrooms (Megacollybia platyphylla) on roadside near Lembolovo, north from Saint Petersburg. Russia, August 24, 2018
Whitelaced shank mushrooms (Megacollybia platyphylla) in a forest east from a train stop Platform 46 km near Semrino, south from Saint Petersburg. Russia, August 10, 2024
Whitelaced shank mushrooms (Megacollybia platyphylla) between Oselki and Toksovo, north from Saint Petersburg. Russia, August 13, 2024Observations of Megacollybia platyphylla in Leningrad Oblast and north-western Russia show that the fungus grows in various locations, including forests around Kavgolovskoe Lake, Toksovo, Oselki, and Lisiy Nos. It was found near Saint Petersburg, with sightings in Sosnovka Park, Yuntolovsky Park, and Lembolovo. The mushroom often grows near rotten logs or stumps, as seen in observations 5, 13, and 15. Multiple sightings were recorded in the same locations over different years, such as Lembolovo in 2017 and 2018. The fungus was observed from July to September, with a peak in August, suggesting a summer to early fall fruiting period. The mushrooms were found in groups, as seen in observations 8, 12, and 14, and solo, as in observations 1, 3, and 9.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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