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Amanita magniverrucata

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

by Michael Kuo

White Amanita species in section Lepidella are notoriously difficult to separate, but Amanita magniverrucata is fairly easily recognized by its huge pyramid-shaped warts, its slightly rooting stem base, and its range (from northern California to Baja California). Amanita cokeri is similar, but its warts are much smaller, and its stem base features prominent, peeled-back scales--and it appears thousands of miles away, in eastern North America.

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


Ecology: Mycorrhizal; originally recorded under Bishop pine, but since reported under other conifers and, according to Jenkins (1986) and Tulloss (2013), under coast live oak; winter; distributed from northern California to Baja California.

Cap: 4-15 cm; convex, expanding to planoconvex; when young with an inrolled margin; covered over the center with very large, pyramid-shaped warts, and towards the margin with smaller warts; whitish, sometimes bruising and discoloring slightly brownish; the margin often appendiculate with hanging veil material.

Gills: Free from the stem; close; whitish; with frequent short-gills.

Stem: 5-12 cm long; up to 3 cm thick; equal or tapering slightly to apex; whitish; sometimes bruising and discoloring brownish to reddish brown; bald or finely hairy; with a large, white, delicate ring that is often lost by maturity; with a swollen base that usually has a root-like extension; with whitish veil material at the base, usually appearing as concentric zones of soft scales at the top of the bulb and the lower part of the stem.

Flesh: White; unchanging when sliced.

Odor: Unpleasant and strong, or not distinctive.

Spore Print: White.

Microscopic Features: Spores 8-13 x 5-8.5 µ; ellipsoid; smooth; amyloid. Basidia 4-spored; with infrequent clamps. Pileipellis poorly differentiated (possibly absent, according to Tulloss, 2009). Lamellar trama bilateral; subhymenium with inflated cells.

REFERENCES: Thiers & Ammirati, 1982. (Thiers, 1982; Arora, 1986; Jenkins, 1986; Phillips, 1991/2005; Tulloss, 2009; Tulloss, 2013.) Herb. UC 1860059 (TD Bruns 3503).

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Amanita magniverrucata

Amanita magniverrucata

Amanita magniverrucata

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