Major Groups > Oddballs & Misfits > Gasteroid Gilled Mushrooms & Boletes > Chamonixia caespitosa
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Chamonixia caespitosa

[ Basidiomycetes > Boletales > Boletaceae > (Chamonixia) Leccinum . . . ]

by Michael Kuo

Believe it or not, Chamonixia caespitosa is apparently a species of Leccinum. A series of recent DNA studies (see the Leccinum page) supports this idea, placing species of Chamonixia and Octavianina alongside species like Leccinum chromapes and Leccinum pseudoscabrum. This result was a bit of a surprise; unlike many other "gasteroid" mushrooms, Chamonixia caespitosa did not give pre-DNA researchers any good hints about its relationship to "normal" mushrooms, aside from appearing to belong with the boletes.

Among the many truffle-like, gasteroid mushrooms found in western North America, species of Chamonixia can be recognized by the presence of a "columella" (central tissue forming a stem that never--or barely--happened); the brown color of the mature spore mass; the blue bruising of the outer tissues and the columella; and, under the microscope, the longitudinally ribbed spores. Among species of Chamonixia, Chamonixia caespitosa is distinguished by the stubby pseudostem created by the columella, the initially whitish surfaces, the association with conifers, and microscopic features (see below).


Ecology: Mycorrhizal with conifers (especially western hemlock and spruces); usually partially submerged in the soil or completely underground; summer; northern California and the Pacific Northwest.

Fruiting Body: 2-3 cm across; round or nearly so; outer surface whitish at first, silky to finely hairy, bruising blue; pseudostem present as a tiny, stublike extension up to about 4 mm long; interior composed of oblong chambers that are initially whitish but turn dark brown with maturity; columella extending well into the interior from the pseudostem.

Microscopic Features: Spores 18-20.5 x 13-15 µ; more or less elliptical, with a short appendage (a portion of the sterigmatum); longitudinally ribbed; brown in KOH.

REFERENCES: Rolland, 1899. (Saccardo, 1902; Smith & Singer, 1959.) I have not collected or studied this mushroom; the description is based on the sources cited.

This site contains no information about the edibility or toxicity of mushrooms.


Chamonixia caespitosa

Chamonixia caespitosa

Chamonixia caespitosa

Cite this page as:

Kuo, M. (2007, May). Chamonixia caespitosa. Retrieved from the MushroomExpert.Com Web site:

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