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| Gymnopilus ventricosus | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Hymenogastraceae |
| Genus: | Gymnopilus |
| Species: | G. ventricosus
|
| Binomial name | |
| Gymnopilus ventricosus | |
| Synonyms[1] | |
|
Pholiota ventricosa Earle (1902) | |
| Gymnopilus ventricosus | |
|---|---|
| Mycological characteristics | |
 | Gills on hymenium |
 | Cap is convex |
 | Hymenium is adnexed or adnate |
 | Stipe has a ring |
 | Spore print is ochre |
 | Ecology is saprotrophic |
 | Edibility is inedible |
Gymnopilus ventricosus, commonly known as the jumbo gym[2] or western jumbo gym,[3] is a species of mushroom in the family Hymenogastraceae. It was first described from the Stanford University campus by Franklin Sumner Earle as Pholiota ventricosa in 1902.
Description
[edit]The cap is 5 to 30 cm (2 to 11+3⁄4 in) or larger in diameter,[4][5][6][7][8] bright yellow-orange to rusty orange, covered with minute yellow hairs, sometimes becoming scaly. The flesh is thick, yellow and bitter. The gills are yellow to rusty orange, close, adnate to slightly decurrent.[8] The stipe is 7-21 cm long, 1-4 cm thick, yellow-orange, streaked with brown fibrils, club-shaped or ventricose, usually narrowed at the base; partial veil yellowish, forming a superior membranous ring.[6][8] White mycelium at the base of the stipe.[9]
Spores are ellipsoid or ovoid, warty, 7.5–9 x 4–5.5μm. The spore print is rusty brown to rusty orange.[8] Clamp connections are present.[9]
This species contains no psilocybin, and is considered inedible; it is very bitter.[4][9][2]
Habitat and ecology
[edit]Gymnopilus ventricosus grows in groups or dense tufts on dead wood or living pines,[8][9] also on conifers and hardwoods.[8]
See also
[edit]
References
[edit]- ^ "Gymnopilus ventricosus (Earle) Hesler 1969". MycoBank. International Mycological Association. Retrieved 2011-02-09.
- ^ a b Arora, David (February 1, 1991). All that the Rain Promises and More: A Hip Pocket Guide to Western Mushrooms. p. 139. ISBN 9780898153880.
- ^ Siegel, Noah; Schwarz, Christian (September 1, 2024). Mushrooms of Cascadia: A Comprehensive Guide to Fungi of the Pacific Northwest. Humboldt County, CA: Backcountry Press. p. 137. ISBN 9781941624197.
- ^ a b Siegel, Noah; Schwarz, Christian (2016). Mushrooms of the Redwood Coast: A Comprehensive Guide to the Fungi of Coastal Northern California. Clarkson Potter/Ten Speed. p. 152. ISBN 9781607748182. LCCN 2015027853. OCLC 956478776.
- ^ Hesler LR. (1969). North American Species of Gymnopilus (Mycologia Memoir Series: No 3). Knoxville, Tennessee: Lubrecht & Cramer Ltd. pp. 20–21. ISBN 0-945345-39-9.
- ^ a b Trudell, Steve; Ammirati, Joe (2009). Mushrooms of the Pacific Northwest. Timber Press Field Guides. Portland, OR: Timber Press. p. 182. ISBN 978-0-88192-935-5.
- ^ Westerhoff, Jenny (12 September 2023). "Big Laughing Gym (Laughing Jim): Comprehensive Identification Guide - Mushroom Appreciation". www.mushroom-appreciation.com. Retrieved 3 January 2025.
- ^ a b c d e f Stevens, Michael Wood & Fred. "California Fungi: Gymnopilus ventricosus". www.mykoweb.com. Retrieved 2026-01-13.
- ^ a b c d Phillips, Roger (2010). Mushrooms and Other Fungi of North America. Buffalo, NY: Firefly Books. p. 198. ISBN 978-1-55407-651-2.
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