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Tricholoma aurantium

[ Basidiomycetes > Agaricales > Tricholomataceae > Tricholoma . . . ]

by Michael Kuo

This gorgeous Tricholoma is easily recognized by its orange (and usually slimy) cap; its mealy taste; and its distinctive stem, which features orangish scales that terminate near the apex, leaving a white zone at the top. However, Tricholoma aurantium has no partial veil, and the sheathed appearance of the stem results from the arrangement of the tiny scales rather than a true ring. Tricholoma aurantium is mycorrhizal with various conifers and can be found throughout much of North America.

I am enough of a mushroom dork to have been thrilled when I discovered (while studying the "Material Cited" sections of Ovrebo's 1980 dissertation on Tricholoma--I told you I was a dork) that the illustrated collection was made in the same location as collections made by prominent mycologists over the years, including Robert Shaffer in 1968 and Nancy Weber in 1974. The Carp Creek Gorge in Cheboygan County, Michigan, is a beautiful location, and Tricholoma aurantium appears to have set up permanent residence under the stately pines found there.


Ecology: Mycorrhizal with conifers; growing scattered or gregariously, sometimes in clusters; fairly widely distributed in North America; summer and fall.

Cap: 3-9 cm; broadly convex or nearly flat; slimy or sticky when fresh; orange to dull reddish orange, bruising dark red; smooth or with scattered, appressed fibers and scales; the margin initially inrolled.

Gills: Attached to the stem, often by means of a notch; close; whitish, developing brown to reddish brown discolorations.

Stem: 4-8 cm long; 1-2 cm thick; more or less equal, or tapering to the base; covered with dense, orangish scales that terminate in a line near the apex; white above; often hollow.

Flesh: White; not changing on exposure.

Odor and Taste: Mealy.

Spore Print: White.

Microscopic Features: Spores 5-6 x 3-4 µ; smooth; elliptical; inamyloid. Cystidia absent. Clamp connections absent.

REFERENCES: (Schaeffer, 1774) Ricken, 1915. (Quélet, 1886; Saccardo, 1887; Kauffman, 1918; Smith, Smith & Weber, 1979; Ovrebo, 1980; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Barron, 1999; Roody, 2003.) Herb. Kuo 09120409, 09150714, 08140802.

Further Online Information:

Tricholoma aurantium at Roger's Mushrooms


Tricholoma aurantium

Tricholoma aurantium

Tricholoma aurantium

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Cite this page as:

Kuo, M. (2004, December). Tricholoma aurantium. Retrieved from the MushroomExpert.Com Web site: