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Gomphidius oregonensis

[ Basidiomycota > Boletales > Gomphidiaceae > Gomphidius . . . ]

by Michael Kuo

This West-Coast species of Gomphidius is highly variable in its colors: it ranges from pinkish to reddish brown to pale brown or, in age, dark reddish brown to nearly black. Its spores are substantially shorter than the spores of other West-Coast species, and this may provide the easiest way of separating it—especially since it does not always appear in its "typical" growth form, in clusters with deeply rooted stem bases. What is with mushrooms? Do they not ever read field guides and mycological literature to figure out how to act?


Ecology: Mycorrhizal with conifers, especially Douglas-Fir; typically growing in clusters, but not infrequently growing alone or scattered; fall and winter; West Coast to Idaho and Montana. The illustrated and described collection is from California.

Cap: 3–10 cm wide; convex, becoming planoconvex; bald; slimy; streaked; pale pinkish to brownish when young, becoming dark reddish brown to dark brown, or sometimes fading to tan; spotting and discoloring blackish to black in places or overall with age.

Gills: Running down the stem; close; pale buff at first, becoming smoky gray; short-gills frequent.

Stem: 5–10 cm long; 1–2 cm wide; tapering to base; often rooting; with a fibrillose partial veil that is typically poorly developed and hard to distinguish underneath the slime veil; at maturity slimy over the lower portion; sometimes adorned with a ring or ring zone that becomes blackened by spores; whitish above, dull to bright yellow below; discoloring and bruising black.

Flesh: White in cap; yellow in stem.

Odor and Taste: Not distinctive.

Spore Print: Purplish gray to black.

Microscopic Features: Spores 11–13 x 4–5 µm; fusiform or narrowly ellipsoid; smooth; brownish in KOH. Hymenial cystidia to 125 x 12.5 µm; cylindric to narrowly fusoid; thin-walled; hyaline in KOH. Pileipellis an ixocutis. Clamp connections not found.

REFERENCES: Peck, 1898. (Miller, 1971; Smith, 1975; Smith, Smith & Weber, 1979; Thiers, 1985; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Miller, 2003; Bessette, Miller, Bessette & Miller, 1995; Desjardin, WOod & Stevens, 2015; Siegel & Schwarz, 2016.) Herb. Kuo 01161302.

This website contains no information about the edibility or toxicity of mushrooms.


Gomphidius oregonensis

Gomphidius oregonensis

Gomphidius oregonensis

Gomphidius oregonensis

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Kuo, M. (2020, July). Gomphidius oregonensis. Retrieved from the MushroomExpert.Com Web site: