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Amanita calyptroderma

[ Basidiomycetes > Agaricales > Amanitaceae > Amanita . . . ]

by Michael Kuo

Amanita calyptroderma appears in the fall and winter in the Pacific Northwest--with Douglas-fir in the northern part of its range, and with Pacific madrone in southern Oregon and northern California. It has an orangish to orangish brown or yellowish brown cap that features a prominent white patch. Its stem almost always displays a ring above and a sacklike, white to yellowish volva below.

Amanita vernicoccora is a similar species with a pale yellow (or nearly white) cap; it appears in the spring and usually smells like dead fish. Also similar is another springtime species, Amanita velosa, which lacks a ring.

Amanita calyptrata and Amanita lanei are synonyms.

Thanks to University of California Herbarium for facilitating my study of the collection cited below.


Ecology: Mycorrhizal with Douglas-fir in northern Oregon, Washington, and British Columbia--and primarily with Pacific madrone in southern Oregon and northern California; growing alone, scattered, or gregariously; fall and winter; distributed in northern California and the Pacific Northwest.

Cap: 8-20 cm (sometimes larger); round at first, becoming convex or nearly flat; sticky when fresh; bald; orangish to orangish brown or yellowish brown; often paler toward the margin; typically adorned with one or a few large, thick, white patches; the margin faintly to strongly lined at maturity.

Gills: Free from the stem or attached to it; white; close or crowded; short gills frequent.

Stem: 7-25 cm long; up to 4 cm thick; more or less equal; bald or powdery; whitish, often discoloring and bruising slightly brownish; with a cream-colored, skirt-like ring; the base enclosed in a sack-like, white to yellowish volva that sometimes crumbles.

Flesh: White to faintly yellowish; unchanging when sliced.

Odor: Not distinctive.

Spore Print: White.

Microscopic Features: Spores 9-12 x 6-8 µ; smooth; broadly ellipsoid; inamyloid. Basidia 4-spored; basally clamped. Pileipellis an ixocutis of elements 2-7 µ wide. Lamellar trama bilateral; subhymenium ramose to subcellular.

REFERENCES: (Murrill) Saccardo & Trotter, 1898. (Smith, 1975; Smith, Smith & Weber, 1979; Thiers, 1982; Arora, 1986; Jenkins, 1986; Phillips, 1991/2005; Lincoff, 1992; Trudell & Ammirati, 2009.) Herb. UC 1861076 (TD Bruns 3808).

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


Amanita calyptroderma

Amanita calyptroderma

Amanita calyptroderma

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Kuo, M. (2013, July). Amanita calyptroderma. Retrieved from the MushroomExpert.Com Web site: