NA Fungi 8(5): 2. 2013.
Common Name: none
Misapplied names: Amanita franchetii (Boudier) Fayod; Amanita aspera Fries
Cap 4-12 cm broad, convex, expanding to plano-convex; margin incurved, becoming decurved, not striate or if so, obscurely; surface smooth, dry, light-brown, ochraceous-brown, to buff-brown, darkest at the disc with scattered yellowish to buff-brown warts; flesh soft, white to pale yellowish.
Gills close, adnexed to free, close, white, tinged yellowish near the cap margin.
Stipe 5-15 cm long, 1-2 cm thick, stuffed, tapering to an enlarged, often bulbous base; surface whitish, sparsely pubescent or with scattered, flattened scales; partial veil membranous, cream-colored, forming a fragile, superior, skirt-like ring, the latter often with a yellowish margin; universal veil consisting of yellowish to grey warts or scales arranged concentrically on the basal bulb.
Spores 8-12 x 6-8 µm, elliptical, smooth, amyloid; spore print white.
Solitary or in small groups in mixed hardwood/conifer woods; fruiting from late fall to mid-winter.
Evidence is increasing that this is an edible species.
Amanita augusta has long been called Amanita franchetii in California, a species now known to be restricted to Europe. Amanita augusta is recognized by a brown to yellow brown cap with yellowish warts, a yellow margined annulus, and a scaly/warted volva. It is found regularly each season, but seldom in large numbers.
Bojantchev, D. & Davis, M. (2013). Amanita augusta, a new species from California and the Pacific Northwest. North American Fungi 8(5): 1-11. (PDF)
Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
Jenkins, David T. (1986). Amanita of North America. Mad River Press: Eureka, CA. 197 p.
Smith, A.H. (1949). Mushrooms in their Natural Habitats. Sawyer's Inc: Portland, OR. 626 p.
Thiers, Harry D. (1982). The Agaricales (Gilled Fungi) of California. 1. Amanitaceae. Mad River Press: Eureka, CA. 53 p.