Amanita umbrinidisca (Murrill) Murrill 1912

Venenarius umbrinidiscus Murrill, Mycologia 4: 242. 1912
Amanita umbrinidisca Murrill, Mycologia 4: 262. 1912.
Pileus fleshy, drying very thin, convex to expanded, at length depressed, umbonate, solitary, reaching 10 cm. broad; surface moist, glabrous, with large, irregular, adherent patches of the white volva, melleous, fading to stramineous on the conspicuously long-striate margin, the umbo yellow in young plants, becoming umbrinous; lamellae free, broad, not crowded, white; spores large, subglobose, smooth, hyaline, 7-9 m; stipe white or slightly yellowish, tapering upward, 12 cm. long, 1-2 cm. thick; annulus ample, white, persistent, fixed above the center of the stipe; volva rather short, white, tough, 3 cm. broad, with subentire free limb.
Type locality: Seattle, Washington. Habitat: On the ground in a fir forest. Distribution: Washington.