Extract from Wikipedia article: Armillaria gallica (synonymous with A. bulbosa and A. lutea) is a species of honey mushroom in the family Physalacriaceae of the order Agaricales. The species is a common and ecologically important wood-decay fungus that can live as a saprobe, or as an opportunistic parasite in weakened tree hosts to cause root or butt rot. It is found in temperate regions of Asia, North America, and Europe. The species forms fruit bodies singly or in groups in soil or rotting wood. The fungus has been inadvertently introduced to South Africa. Armillaria gallica has had a confusing taxonomy, due in part to historical difficulties encountered in distinguishing between similar Armillaria species. The fungus received international attention in the early 1990s when an individual colony living in a Michigan forest was reported to cover an area of 15 hectares (37 acres), weigh at least 9,500 kilograms (21,000 lb), and be 1,500 years old. This individual is popularly known as the "humungous fungus", and is a tourist attraction and inspiration for an annual mushroom-themed festival in Crystal Falls. Recent studies have revised the fungus's age to 2,500 years and its size to about 440 tons, four times the original estimate.
Bulbous honey mushrooms (Armillaria gallica) east from Ilikovskaya Alley in Lomonosov (Oranienbaum). West from Saint Petersburg, Russia, September 11, 2013 Ilikovskiy prospekt, 26А, Lomonosov, Saint Petersburg, Russia, 198412
Bulbous honey mushrooms (Armillaria gallica) on a tree stump near Kavgolovskoe Lake south from Oselki, 8 miles north from Saint Petersburg. Russia, September 23, 2015 Unnamed Road, Oselki, Leningradskaya oblast', Russia, 188665
Bulbous honey mushrooms (Armillaria gallica) on the ground in spruce forest in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Bulbous honey mushrooms (Armillaria gallica) on a log in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Bulbous honey mushrooms (Armillaria gallica) on the ground in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Cluster of bulbous honey mushrooms (Armillaria gallica) in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Orange milkcap mushrooms (Lactarius aurantiacus) together with bulbous honey mushrooms (Armillaria gallica) in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Caps of bulbous honey mushrooms (Armillaria gallica) in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Bulbous honey mushrooms (Armillaria gallica) on a mossy branch in Posiolok near Vyritsa, south from Saint Petersburg, Russia, October 16, 2016 Unnamed Road, Vyritsa, Leningradskaya oblast', Russia, 188381
Bulbous honey mushrooms (Armillaria gallica(?)) and some bracket fungus on a stump in Literatorskie Mostki section of Volkovo Cemetery. Saint Petersburg, Russia, October 17, 2016 Rasstannaya ulitsa, 30, Sankt-Peterburg, Russia, 192007
Bulbous honey fungus (Armillaria gallica) and Velvet shank (Flammulina velutipes) on a peninsula of 4-th South Pond on Elagin Island. Saint Petersburg, Russia, October 7, 2017 Naberezhnaya Martynova, 70-74, Sankt-Peterburg, Russia, 197110
Bulbous honey fungus (Armillaria gallica) west from 1-st Elagin Bridge on Elagin Island. Saint Petersburg, Russia, October 7, 2017 Острова, округ Чкаловское, Санкт-Петербург, Северо-Западный федеральный округ, 197110, Россия
Bulbous honey fungus (Armillaria gallica) on a lawn west from 1-st Elagin Bridge on Elagin Island. Saint Petersburg, Russia, October 7, 2017 Острова, округ Чкаловское, Санкт-Петербург, Северо-Западный федеральный округ, 197110, Россия
Caps of bulbous honey fungus (Armillaria gallica) west from 1-st Elagin Bridge on Elagin Island. Saint Petersburg, Russia, October 7, 2017 Острова, округ Чкаловское, Санкт-Петербург, Северо-Западный федеральный округ, 197110, Россия
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