Major Groups > Gilled Mushrooms > Pale-Spored > Collybioid > Calocybe onychina


Calocybe onychina

[ Basidiomycota > Agaricales > Lyophyllaceae > Calocybe . . . ]

by Michael Kuo

This attractive but fairly rarely encountered mushroom is found under mountain conifers from Idaho to the Four Corners region, and west to the Pacific Northwest. Defining features include a white spore print, yellow gills, and a pinkish to purplish stem. It is reminiscent of Tricholomopsis rutilans, but grows terrestrially rather than on wood. Calocybe ionides is also similar, but features white gills and more purple colors in the cap and stem; additionally, it appears under hardwoods at low elevations.

Rugosomyces onychinus is a synonym.

Thanks to Regan Dixon for collecting, documenting, and preserving Rugosomyces onychinus for study; the collection is now deposited in The Herbarium of Michael Kuo.


Ecology: Probably saprobic; growing alone, scattered, or gregariously under conifers, especially subalpine fir, Engelmann spruce, and Douglas-fir; summer and fall; originally described from Sweden; in Europe distributed in northern and montane regions; in North America distributed from central Idaho to the Four Corners, west to the Pacific Northwest. The illustrated and described collections are from Colorado and British Columbia.

Cap: 2–5 cm; broadly convex becoming broadly bell-shaped or nearly flat; dry; more or less bald; deep, dusky purple to purplish red or purple-brown; the margin inrolled when young.

Gills: Attached to the stem by means of a notch; close; short-gills frequent; bright to dull yellow.

Stem: 2–5 cm long; up to 1 cm wide; more or less equal; dry; fairly bald; purplish.

Flesh: Yellowish; not changing when sliced; thin.

Odor & Taste: Not distinctive.

Chemical Reactions: KOH negative on cap surface.

Spore Print: White.

Microscopic Features: Spores 3–4.5 x 2–3 µ; ellipsoid; smooth; hyaline in KOH; inamyloid. Basidia 4-sterigmate. Hymenial cystidia not found. Lamellar trama parallel. Pileipellis hymeniform; golden orangish brown in KOH; terminal cells clavate, 6–13 µm wide. Clamp connections present.

REFERENCES: (E. M. Fries, 1838) M. A. Donk, 1962. (Smith, 1941; Singer, 1978; Moser, 1983; Bessette, Miller, Bessette & Miller, 1995; Bellanger et al., 2015; Desjardin, Wood & Stevens, 2016; Kalamees, 2018; He et al., 2019.) Herb. Kuo 08110701, 10271801.

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Calocybe onychina

Calocybe onychina

Calocybe onychina

Calocybe onychina
Spore print

Calocybe onychina

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Kuo, M. (2022, August). Calocybe onychina. Retrieved from the MushroomExpert.Com Web site: