Tricholoma brunneoluteum

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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 m; 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 m wide, smooth or finely encrusted, hyaline to reddish brown or orangish brown in KOH. Clamp connections not found.

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