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Tricholoma brunneoluteum

by Michael Kuo, 24 October 2024

I find this Tricholoma species under oaks in the Midwest, in summer and fall. It has an orangish brown to reddish brown cap, pale yellow gills that eventually spot and discolor rusty brown, and a strong, mealy odor. Its cap turns brownish red with a drop of KOH.

I identified this mushroom previously as "Tricholoma fulvum," both here, prior to 2019, and in Mushrooms of the Midwest (Kuo & Methven 2014)—but that species is circumboreal and associated almost exclusively with birches (Christensen & Heilmann-Clausen 2013). From 2019 to 2024 Tricholoma brunneoluteum appeared here as "Tricholoma species 01."

Peck's Tricholoma transmutans, originally described from New York in 1878, may represent the same mushroom. Peck said the species occurred on the "[g]round in woods," without specifying trees. His brief description, which calls the gills "whitish or pale yellow," is a plausible match for the mushroom described here—although some authors (Bessette and collaborators 2013) have used the name transmutans to apply to a conifer-associated species with buff, rather than yellow, gills.

Description:

Ecology: Mycorrhizal with oaks; growing alone, scattered, or gregariously; originally described from Oklahoma (Ovrebo, Kuo & Hughes 2021); probably widely distributed in North America east of the Rocky Mountains; summer and fall. The illustrated and described collections are from Illinois and Kentucky.

Cap: 3–7 cm; at first convex, expanding to broadly convex; bald, but often becoming sparsely and minutely pitted; orangish brown, fading to orangish tan; tacky when fresh but soon dry; the margin inrolled when young, not becoming lined.

Gills: Narrowly attached to the stem, sometimes by means of a notch; close; short-gills frequent; pale yellow from the first; spotting and discoloring rusty brown with age.

Stem: 3–7 cm long; 1–2 cm thick; more or less equal; pale at the apex, brownish below; sometimes developing reddish brown streaks; hollowing with age; bald or finely pruinose; basal mycelium whitish or pale pastel yellow.

Flesh: White, or in the stem sometimes yellowish; not changing on exposure.

Odor and Taste: Strongly mealy.

Chemical Reactions: KOH on cap surface brownish red.

Spore Print: White.

Microscopic Features: Spores 5–7 x 3.5–5 µm; broadly ellipsoid, with a small apiculus; smooth; hyaline in KOH, often with one large oil droplet; inamyloid. Basidia 4-sterigmate. Cystidia not found. Pileipellis a partially gelatinized cutis; elements 3–10 µm wide, smooth or finely encrusted, hyaline to reddish brown or orangish brown in KOH. Clamp connections not found.


REFERENCES: C. L. Ovrebo, M. Kuo & K. W. Hughes, 2021. (Peck, 1878; Kauffman, 1918; Ammirati & Ovrebo, 1979; Ovrebo, 1980; Bessette et al., 2013; Christensen & Heilmann-Clausen, 2013; Kuo & Methven, 2014; Ovrebo et al. 2021; Landry et al., 2022.) Herb. Kuo 07270706 (PARATYPE), 09240802, 09241108, 09011606.


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Tricholoma brunneoluteum

Tricholoma brunneoluteum

Tricholoma brunneoluteum

Tricholoma brunneoluteum

Tricholoma brunneoluteum

Tricholoma brunneoluteum
KOH

Tricholoma brunneoluteum
Spores and basidia

Tricholoma brunneoluteum
Pileipellis elements



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Cite this page as:

Kuo, M. (2024, October). Tricholoma brunneoluteum. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/tricholoma_brunneoluteum.html