Gymnopilus junonius

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Gymnopilus junonius
Gymnopilus junonius-02.jpg
Scientific classification
Binomial name
Gymnopilus junonius
(Fr.) P.D.Orton (1960)
Gymnopilus junonius.png
Approximate range of Gymnopilus junonius
  • Agaricus aureus Bull. (1782)
  • Agaricus junonius Fr. (1821)
  • Lepiota aurea Gray (1821)
  • Pholiota junonia (Fr.) P.Karst. (1879)
  • Pholiota grandis Rea (1903)
  • Pholiota spectabilis var. junonia (Fr.) J.E.Lange (1940)
  • Gymnopilus spectabilis var. junonius (Fr.) Kühner & Romagn. (1953)
Gymnopilus junonius
View the Mycomorphbox template that generates the following list
gills on hymenium
cap is convex
hymenium is adnate
stipe has a ring
spore print is reddish-brown
ecology is saprotrophic
edibility: inedible

Gymnopilus junonius is a species of mushroom in the family Cortinariaceae. Commonly known as the spectacular rustgill, this large orange mushroom is typically found growing on tree stumps, logs, or tree bases. Some subspecies of this mushroom contain the neurotoxic oligoisoprenoid gymnopilin.


This species was formerly known as Gymnopilus spectabilis, or Pholiota spectabilis v. junonia (Fr.) J.E Lange.[1] The 'Gymn' in the present nomen means 'naked', and 'Juno' was the wife of Jupiter.[2]


The cap ranges from 8–30 cm (3–12 in) across, is convex to flat,[3] and is bright yellow-orange in younger specimens and orange/brown or reddish brown in older ones, with a dry scaly surface. The flesh is yellow, the odor mild and taste bitter.[3] The stem is 5–25 cm (2–10 in) long, 1–5 cm thick, and often narrows near the base.[3] The frail ring is dusted with rusty orange spores, and the gill attachment to the stem is adnate to sub-decurrent.[3] It stains red with KOH and turns green when cooked in a pan. The spore print is rusty orange. Unlike psychoactive relatives in the Psilocybe genus, it typically does not bruise blue, but smaller specimens, or "aborts", occasionally exhibit bruising.[4] This mushroom usually grows in clusters from several to several dozen individuals, but sometimes grows solitary.

The mushroom is inedible. Some varieties are hallucinogenic.[3]

Gymnopilus junonius

Similar species[edit]

This mushroom is often mistaken for Gymnopilus ventricosus, which also contains no psilocybin.[citation needed] It also resembles Armillaria mellea and Omphalotus olivascens.[3]

Distribution and habitat[edit]

Gymnopilus junonius is found in Europe, Australasia and both North[5][6][7] and South America. It grows in dense clusters on stumps and logs of hardwoods and conifers. This mushroom is most common in moist, lowland wooded areas near rivers.


This mushroom contains bis-noryangonin and hispidin, which are structurally related to alpha-pyrones found in kava.[8] Japanese researchers have found oligoisoprenoids, or neurotoxins in this mushroom.[9]

See also[edit]


  1. ^ Roger Phillips (2006). Mushrooms. Pan MacMillan. ISBN 0-330-44237-6.
  2. ^ Arora D. (1986). Mushrooms Demystified. Ten Speed Press. ISBN 0-89815-169-4.
  3. ^ a b c d e f Davis, R. Michael; Sommer, Robert; Menge, John A. (2012). Field Guide to Mushrooms of Western North America. Berkeley: University of California Press. pp. 245–246. ISBN 978-0-520-95360-4. OCLC 797915861.
  4. ^ Thorn, R. Greg; Malloch, David W.; Saar, Irja; Lamoureux, Yves; Nagasawa, Eiji; Redhead, Scott A.; Margaritescu, Simona; Moncalvo, Jean-Marc (2020-04-24). "New species in the Gymnopilus junonius group (Basidiomycota: Agaricales)". Botany. Canadian Science Publishing. 98 (6): 293–315. doi:10.1139/cjb-2020-0006. ISSN 1916-2790.
  5. ^ "Archived copy". Archived from the original on 2021-01-04. Retrieved 2020-09-27.CS1 maint: archived copy as title (link)
  6. ^ "Archived copy". Archived from the original on 2021-01-04. Retrieved 2020-09-27.CS1 maint: archived copy as title (link)
  7. ^ "Archived copy". Archived from the original on 2021-01-04. Retrieved 2020-09-27.CS1 maint: archived copy as title (link)
  8. ^ Hatfield, G.M.; Brady, L.R. (1969). "Occurrence of bis-noryangonin in Gymnopilus spectabilis". Journal of Pharmaceutical Sciences. 58 (10): 1298–1299. doi:10.1002/jps.2600581039. PMID 5388695.
  9. ^ Tanaka, Masayasu; Hashimoto, Kimiko; Okunoa, Toshikatsu; Shirahama, Haruhisa (1993). "Neurotoxic oligoisoprenoids of the hallucinogenic mushroom, Gymnopilus spectabilis". Phytochemistry. 34 (3): 661–664. doi:10.1016/0031-9422(93)85335-O.
  • C.J. Alexopolous, Charles W. Mims, M. Blackwell et al., Introductory Mycology, 4th ed. (John Wiley and Sons, Hoboken NJ, 2004) ISBN 0-471-52229-5

External links[edit]