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Tricholoma subluteum

[ Basidiomycota > Agaricales > Tricholomataceae > Tricholoma . . . ]

by Michael Kuo

Tricholoma subluteum features a yellow cap overlaid with yellow appressed fibrils, white gills that sometimes discolor yellow in places, and a white stem that is also sometimes flushed with yellow. Under the microscope, Tricholoma subluteum features ellipsoid spores and an ixocutis, but lacks cheilocystidia or clamp connections.

Precise determination of the mycorrhizal association of Tricholoma subluteum is uncertain, although it may be limited to conifers. The species was rarely recorded until 2013, when publication of Tricholomas of North America (Bessette et al.) provided the name and a photo for a larger-than-just-specialists audience; now the name is often applied to photos in online venues like iNaturalist and Mushroom Observer. In most of these cases, however, reports are made without vouchered specimens, making the "documentation" essentially useless for scientific purposes. "This person thinks the mushroom in this photo looks like Tricholoma subluteum" is as far as that science is going. So, if you'd like to help science figure out this species, please take careful note of the trees in the vicinity, and save your collection in a local herbarium (or, if you want, my herbarium).


Ecology: Mycorrhizal, possibly with spruces, eastern hemlock and other conifers—but often found in "mixed woods" where precise determination of mycorrhizal host is difficult; growing alone, scattered, or gregariously; late summer and fall; eastern North America. The illustrated and described collections are from oak-hemlock-maple-pine woods in Kentucky.

Cap: 4–7 cm across; at first conical-convex with a central bump, becoming broadly convex with a central bump; moist when fresh but soon dry; finely, radially appressed-fibrillose with yellow fibrils on a yellow ground—usually with a darker, slightly brownish or grayish center.

Gills: Attached to the stem by a notch; close; short-gills frequent; whitish, sometimes staining or discoloring yellow, especially toward the cap margin.

Stem: 4–9 cm long; 1–1.5 cm thick; equal; bald; dry; whitish, or with flushes of pale yellow.

Flesh: White; unchanging when sliced.

Odor and Taste: Mealy.

Chemical Reactions: KOH negative on cap surface.

Spore Print: White.

Microscopic Features: Spores 4.5–7 x 3.5–5 µm; ellipsoid; smooth; hyaline in KOH; inamyloid. Lamellar trama parallel. Basidia 4-sterigmate. Hymenial cystidia not found. Pileipellis an ixocutis; elements 2.5–7.5 µm wide, smooth, hyaline in KOH. Clamp connections not found.

REFERENCES: Peck, 1904. (Ovrebo, 1980; McNeil, 2006; Bessette et al., 2013.) Herb. Kuo 10150404, 10051508.

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Tricholoma subluteum

Tricholoma subluteum

Tricholoma subluteum

Tricholoma subluteum

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Kuo, M. (2019, September). Tricholoma subluteum. Retrieved from the MushroomExpert.Com Web site: