Small cup mushrooms Hymenoscyphus fructigenus on acorn shell in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017
ulitsa Professora Popova, 1/6, St Petersburg, Russia, 197022Synonyms: Ciboria fructigena, Helotium fructigenum, Helotium salicinum, Helotium virgultorum, Hymenoscyphus fungoidaster, Hymenoscyphus salicinus, Leptostroma virgultorum, Octospora fungoidaster, Peziza fructigena, Peziza salicina, Phialea fructigena, Phialea salicina.
Common name: nut disco.
Russian name: Gimenostsifus plodovoliubivyy.
Hymenoscyphus fructigenus is a species of fungus that grows on rotten wood and fruit. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found in various habitats, including forests, parks, and gardens, typically on decaying branches and trunks of deciduous trees, particularly apple, ash, and birch. The fungus produces small, cup-shaped or disk-like fruiting bodies that are yellow to orange in color and reach 0.5-2 cm in diameter. It is a common species in the region, often fruiting from July to October.
Small cup mushrooms Hymenoscyphus fructigenus on acorn shell in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017ulitsa Professora Popova, 1/6, St Petersburg, Russia, 197022
Small cup mushrooms Hymenoscyphus fructigenus on a rotting acorn in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, September 12, 2017ulitsa Professora Popova, 1/6, St Petersburg, Russia, 197022
Nut disco mushrooms (Hymenoscyphus fructigenus) on an acorn in Blizhnie Dubki area near Lisiy Nos, west from Saint Petersburg. Russia, September 26, 2017Polyanskaya Doroga, Sankt-Peterburg, Russia, 197755
Cup mushrooms Hymenoscyphus fructigenus on a rotting acorn near Lisiy Nos, west from Saint Petersburg. Russia, September 6, 2018Saint Petersburg, Russia, 197755
Cup mushrooms Hymenoscyphus fructigenus on an acorn skin in a coastal forest between Lisiy Nos and Olgino, west from Saint Petersburg. Russia, September 6, 2018Saint Petersburg, Russia, 197755Observations of the fungus Hymenoscyphus fructigenus were made in Leningrad Oblast and north-western Russia. The fungus was found on acorn shells and rotting acorns in various locations, including the Botanic Gardens of Komarov Botanical Institute in Saint Petersburg, Blizhnie Dubki area near Lisiy Nos, and coastal forests between Lisiy Nos and Olgino. The mushrooms were observed on multiple occasions, specifically on September 12, 2017, September 26, 2017, and September 6, 2018. They were identified as small cup mushrooms or nut disco mushrooms, growing on acorn skins or rotting acorns. The consistent presence of Hymenoscyphus fructigenus in these areas suggests that it is a common fungus in the region, particularly in association with oak trees and their debris. The observations highlight the fungus's tendency to grow on decaying organic matter.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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