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Entoloma luteum

[Basidiomycota > Agaricales > Entolomataceae > Entoloma . . . ]

by Michael Kuo

Entoloma luteum is like the drab, dreary little brother of Entoloma quadratum and Entoloma murrayi, both of which are brightly colored. Unlike its siblings, Entoloma luteum is a dull brownish yellow—and its cap is not as acutely conic. It is found in hardwood and mixed hardwood-conifer forests, often near moss, in eastern North America. Under the microscope it features cube-shaped spores and long cheilocystidia.

Rhodophyllus luteus and Inocephalus luteus are synonyms.

Thanks to Fluff Berger for collecting, documenting, and preserving Entoloma luteum for study; her collection is deposited in The Herbarium of Michael Kuo.


Ecology: Saprobic; growing alone, scattered, or in little clusters under hardwoods or mixed hardwoods and conifers; summer and fall; probably fairly widely distributed east of the Great Plains. The illustrated and described collections are from Michigan and Pennsylvania.

Cap: 1–3 cm; rounded-conical or bell-shaped; dry; bald, or finely silky over the center; dull brownish yellow, occasionally with a greenish tinge; fading to dull yellowish; the margin becoming finely lined.

Gills: Narrowly attached to the stem; nearly distant; at first whitish or yellowish, becoming brownish pink with maturity.

Stem: 3–6 cm long; 2–4 mm thick; more or less equal; dry; bald or very finely hairy; whitish near the apex, elsewhere colored like the cap; basal mycelium white.

Flesh: Thin; fragile; yellowish.

Odor: Not distinctive.

Spore Print: Pink.

Microscopic Features: Spores 8–12 µm; cuboid; smooth; walls about 0.5 µm thick; hyaline to yellowish, often with one large oil droplet, in KOH. Basidia 4-sterigmate. Pleurocystidia not found. Cheilocystidia 50–100+ x 10–15 µm; cylindric with rounded or clavate apices. Pileipellis a cutis with frequently uplifted terminal elements; golden in 10% ammonia; pigment granular and intracellular. Clamp connections present.

REFERENCES: Peck, 1902. (Saccardo, 1905; AH Smith, 1953; Hesler, 1967; Horak, 1976; Barron, 1999; Roody, 2003; McNeil, 2006; Baroni, 2017.) Herb. Kuo 09110409, 08191901.

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Entoloma luteum

Entoloma luteum

Entoloma luteum

Entoloma luteum

Entoloma luteum

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