Lemon discos mushrooms (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, August 25, 2016Synonyms: Calycella citrina, Calycella flava, Calycina citrina, Calycina flava, Helotium citrinum, Helotium flavum, Octospora citrina, Peziza citrina.
Common name: lemon disco.
Russian name: Bisporella limonnaya.
Extract from Wikipedia article: Bisporella citrina, commonly known as yellow fairy cups or lemon discos, is a species of fungus in the family Helotiaceae. The fungus produces tiny yellow cups up to 3 mm (0.12 in) in diameter, often without stalks, that fruit in groups or dense clusters on decaying deciduous wood that has lost its bark. The widely distributed species is found in North Africa, Asia, Europe, North America, and Central and South America. Found in late summer and autumn, the fungus is fairly common, but is easily overlooked owing to its small size. There are several similar species that can in most cases be distinguished by differences in color, morphology, or substrate. Microscopically, B. citrina can be distinguished from these lookalikes by its elliptical spores, which have a central partition, and an oil drop at each end.
Bisporella citrina is a species of fungus that belongs to the family Helotiaceae. It is characterized by its small, yellow-orange apothecia and 2-spored asci. In St. Petersburg, Leningrad Oblast, and north-western Russia, Bisporella citrina has been found growing on decaying wood, plant debris, and other organic matter, often in moist environments such as forests, parks, and along waterways. It typically fruits in late summer to early autumn, with a distribution that is widespread but not particularly common in the region.
Lemon discos mushrooms (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, August 25, 2016
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, August 25, 2016
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) on a tree branch near Lisiy Nos, south from Saint Petersburg. Russia, September 3, 2016
Primorskoye sh., 47, g. Sankt-Peterburg, Russia, 197229
Close up of Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) near Lisiy Nos, south from Saint Petersburg. Russia, September 3, 2016Primorskoye sh., 47, g. Sankt-Peterburg, Russia, 197229
Lemon discos mushrooms (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, September 13, 2016Unnamed Road, Sankt-Peterburg, Russia, 194064
Close up of lemon discos mushrooms (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, September 13, 2016Unnamed Road, Sankt-Peterburg, Russia
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) near Pervomayskoe, Vyborg Region. Russia, September 30, 2016«Скандинавия», Рощинское городское поселение, Выборгский район, Ленинградская область, Северо-Западный федеральный округ, Россия
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) in Lisiy Nos, west from Saint Petersburg. Russia, October 9, 2016Polyanskaya dor., g. Sankt-Peterburg, Russia, 197755
Rotten branch with lemon discos mushrooms (yellow fairy cups, Bisporella citrina) in Lisiy Nos, west from Saint Petersburg. Russia, October 9, 2016Polyanskaya dor., g. Sankt-Peterburg, Russia, 197755
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina)(?) in Dibuny, north-west from Saint Petersburg, Russia, October 23, 2016Unnamed Road, g. Sankt-Peterburg, Russia, 197758
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016Severnyy pr., 24к1, Sankt-Peterburg, Russia, 194295
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) on a stump in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016Severnyy pr., 24к1, Sankt-Peterburg, Russia, 194295
Lemon disco fungus (Bisporella citrina) on a stump in Lembolovo, 35 miles north from Saint Petersburg. Russia, August 8, 2017Unnamed Road, Leningradskaya oblast', Russia, 188695
Lemon disco fungus (Bisporella citrina) in area of Kavgolovskoe Lake near Oselki - Toksovo, north from Saint Petersburg. Russia, August 9, 2017Unnamed Road, Leningradskaya oblast', Russia, 188664
Lemon disco fungus (Bisporella citrina) on a log on an old railroad path near Kuzmolovo, north from Saint Petersburg. Russia, August 10, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Lemon disco mushrooms (Bisporella citrina) near Dibuny, north-west from Saint Petersburg. Russia, August 20, 2017Zapadniy Skorostnoy Diameter, Sankt-Peterburg, Russia, 197758
Lemon disco mushrooms (Bisporella citrina) near Lembolovo, 40 miles north from Saint Petersburg. Russia, September 9, 2017Unnamed Road, Leningradskaya oblast', Russia, 188695
Lemon disco fungus (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017Unnamed Road, St Petersburg, Russia, 194223
Lemon disco mushrooms (Bisporella citrina) in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017Unnamed Road, St Petersburg, Russia, 194223
Lemon disco mushrooms (Bisporella citrina) on a stump in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017Unnamed Road, St Petersburg, Russia, 194223
Lemon disco fungus (Bisporella citrina) on a stump in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, September 14, 2017Lipetskaya Alleya, Pavlovsk, Sankt-Peterburg, Russia, 196625
Lemon disco fungus (Bisporella citrina) on the top of a stump in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, September 14, 2017Lipetskaya Alleya, Pavlovsk, Sankt-Peterburg, Russia, 196625
Lemon disco fungus (Bisporella citrina) with moss on a stump in Pavlovsk Park. Pavlovsk, a suburb of Saint Petersburg, Russia, September 14, 2017Lipetskaya Alleya, Pavlovsk, Sankt-Peterburg, Russia, 196625
Lemon disco fungus (Bisporella citrina) on a stump in Sosnovka Park. Saint Petersburg, Russia, September 23, 2017Ulitsa Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Lemon disco mushrooms (Bisporella citrina) near Kuzmolovo, north from Saint Petersburg. Russia, September 24, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Lemon disco mushrooms (Bisporella citrina) on a log on old railrod tracks near Kuzmolovo, north from Saint Petersburg. Russia, September 24, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Lemon disco mushrooms (Bisporella citrina) on a barkless log on old railrod tracks near Kuzmolovo, north from Saint Petersburg. Russia, September 24, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Lemon disco mushrooms (Bisporella citrina) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017Primorskoye Shosse, Sankt-Peterburg, Russia, 197755
Lemon disco mushrooms (Bisporella citrina) in Pavlovsk Park. Pavlovsk, suburb of Saint Petersburg, Russia, September 27, 2017Parkovaya Ulitsa, 5, Tyarlevo, Sankt-Peterburg, Russia, 196625
Lemon discos mushrooms (yellow fairy cups, Bisporella citrina) on a rotting oak near Lisiy Nos, south from Saint Petersburg. Russia, August 17, 2018Saint Petersburg, Russia, 197755
Lemon discos mushrooms (Bisporella citrina) in area of Blizhnie Dubki near Lisiy Nos, south from Saint Petersburg. Russia, August 17, 2018Экотропа "У Лукоморья", Лисий Нос, Санкт-Петербург, Северо-Западный федеральный округ, 189645, РоссияThe fungus Bisporella citrina was observed in various locations in Leningrad Oblast and north-western Russia between 2016 and 2018. The majority of sightings were in Sosnovka Park, Saint Petersburg, with additional observations in nearby areas such as Lisiy Nos, Pavlovsk Park, and Kuzmolovo. The fungus was typically found on tree branches, stumps, or rotting logs. Observations were made from August to November, with the most frequent sightings in September. The fungus was often described as "lemon discos" or "yellow fairy cups" due to its distinctive yellow color and cup-like shape. Overall, the observations suggest that Bisporella citrina is a common species in the region, particularly in wooded areas with abundant decaying wood. The data provides valuable information on the distribution and habitat preferences of this fungus species.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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