Public Description of Leratiomyces percevalii (Berk. & Broome) Bridge & Spooner

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Name: Leratiomyces percevalii (Berk. & Broome) Bridge & Spooner
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 Draft For Macrofungi Of The Pacific Northwest By Chaelthomas (Private)

Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Strophariaceae

General Description:

Cap: 2.5-8 cm; convex, becoming broadly convex or broadly bell-shaped; sticky when fresh but soon dry; honey yellow when young, quickly becoming yellowish, whitish, or dingy olive; smooth or finely hairy in places; the margin adorned with hanging white partial veil remnants, especially when young.

Gills: Attached to the stem or beginning run down it; close; whitish at first, becoming purplish gray to purple-black.

Stem: 4-13 cm long; up to about 1 cm thick; equal or tapered to base; dry; with a ring zone that darkens with falling spores; finely hairy; whitish, developing reddish brown discolorations from the base upwards; base usually hairy, with prominent mycelial threads.

Flesh: Whitish.

Odor and Taste: Odor not distinctive, or radish-like; taste similar.

Spore Print: Dark purple-brown to blackish.

Chemical Reactions: KOH on cap surface yellow.

Microscopic Features: Spores 13-16 × 7-9 µ; smooth; more or less elliptical; with a germ pore. Chrysocystidia present on gill faces but inconspicuous (more easily demonstrated in button-stage specimens than in mature specimens, where they are often absent); clavate to irregularly clavate or submucronate; scarcely projecting; to about 50 × 8 µ. Cheilocystidia abundant; to about 70 × 10 µ; clavate to cylindric; flexuous.


North American west coast


Saprobic; growing scattered or gregariously in waste places, grassy areas, and woodchips; summer, fall, and winter




Kuo, M. (2009, February). Leratiomyces percevalii. Retrieved from the MushroomExpert.Com Web site:


Current Name:
Leratiomyces percevalii (Berk. & Broome) Bridge & Spooner, Mycotaxon 103: 117 (2008)

Agaricus percevalii Berk. & Broome, Ann. Mag. nat. Hist., Ser. 5 3: 206 (1879)
Fungus percevalii (Berk. & Broome) Kuntze [as ‘percevali’], Revis. gen. pl. (Leipzig) 3(2): 480 (1898)
Psilocybe percevalii (Berk. & Broome) P.D. Orton, Notes R. bot. Gdn Edinb. 29(1): 80 (1969)

Stropharia percevalii (Berk. & Broome) Sacc. [as ‘percevali’], Syll. fung. (Abellini) 5: 1016 (1887)
Stropharia percevalii (Berk. & Broome) Sacc., Syll. fung. (Abellini) 5: 1016 (1887) var. percevalii
Stropholoma percevalii (Berk. & Broome) Ryman, in Knudsen & Vesterholt, Funga Nordica, Agaricoid, Boletoid and Cyphelloid Genera (Gylling): 913 (2008)

Description author: walt sturgeon (Request Authorship Credit)