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Amanita augusta

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

by Michael Kuo

Amanita augusta is a recently named West-Coast species with a gorgeous brown cap that features yellow warts. The base of the stem features flaky yellow patches of universal veil material, and the upper stem displays a pale yellow ring. The species is fond of conifers, although it is sometimes reported under live oaks.

Amanita augusta was previously misidentified as the European species Amanita franchetii. For a somewhat similar species in eastern North America, see Amanita species 06.

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


Ecology: Mycorrhizal with conifers (especially Bishop pine and Douglas-fir), and sometimes reported under coast live oak; usually growing alone or scattered; fall and winter; northern California to Alaska.

Cap: 4-15 cm; convex, becoming broadly convex or flat; dry; brown to yellow-brown, often with a paler marginal area (in wet conditions sometimes becoming yellow overall); adorned with yellow to yellowish warts or patches that are sometimes lost by maturity; the margin not lined.

Gills: Free from the stem by maturity; crowded; whitish or pale yellowish; short-gills frequent.

Stem: 4-15 cm long; 1-3 cm thick; tapering to apex and ending in a swollen bulb; bald or scurfy; yellow, fading to whitish; with a skirtlike, yellow, lined ring; base with concentric yellow girdles of universal veil material when very young, but soon with indistinct flakes and patches of yellow veil material.

Flesh: Whitish to pale yellow; not discoloring on exposure.

Spore Print: White.

Microscopic Features: Spores 7-10 x 4.5-6.5 µ; smooth; ellipsoid; amyloid. Pileipellis an ixocutis of elements 2-7 µ wide. Basidia 4-spored; without clamps. Lamellar trama bilateral; subhymenium with inflated cells.

REFERENCES: Bojantchev & R. M. Davis, 2013. (Thiers, 1982; Arora, 1986; Jenkins, 1986; Phillips, 1991/2005; Lincoff, 1992; Miller & Miller, 2006; Trudell & Ammirati, 2009 [all as franchetii].) Herb. Kuo 01120613; Herb. UC 1999354 (TD Bruns PtR 822).

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Amanita franchetii

Amanita franchetii

Amanita franchetii

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