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Gomphidius oregonensis

[ Basidiomycetes > 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?

Description:

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.

Cap: 3-15 cm wide; convex, becoming planoconvex; bald; very 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; 1-3 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" (a thick layer of clear slime sheathing the young stem and covering the gills); 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 10.5-14 x 4-6 µ; smooth; narrowly ellipsoid or nearly fusiform; brownish in KOH. Hymenial cystidia cylindric to narrowly fusoid; hyaline; thin-walled; up to 125 x 12.5 µ. Caulocystidia similar to hymenial cystidia. Pileipellis an ixocutis.

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.) Herb. Kuo 01161302.

Further Online Information:

Gomphidius oregonensis at MykoWeb
Gomphidius oregonensis at Roger's Mushrooms

 

Gomphidius oregonensis

Gomphidius oregonensis

Gomphidius oregonensis
Spores

Gomphidius oregonensis
Pleurocystidium



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Cite this page as:

Kuo, M. (2014, February). Gomphidius oregonensis. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/gomphidius_oregonensis.html