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1909] ATKINSON—A REMARKABLE AMANITA . 293 
because the calyptra of the volva fits like a skin over the center of the 
pileus. Although a technical description has been published else- 
where,’ it may be well to add a diagnosis here. 
AMANITA CALYPTRODERMA Atkinson & Ballen.s—Plants 1o-15°™ 
high, pileus 10-22°™ broad, stem 2-4°™ stout. Pileus maize-yellow 
to pale chrome-yellow, gills white, then pale maize to cream color, 
annulus and stem pale maize to cream color, volva white. Pileus 
stout, fleshy, convex to expanded and even depressed in age, margin 
striate, slightly viscid when moist, larger part of pileus covered with 
the tough thick calyptra of the volva which fits closely like a skin, 
the margin free, while in age in the larger plants the calyptra of the 
volva is cracked into rather large areas by the expansion of the pileus. 
Gills broad, adnexed, edge more or less floccose. Basidia 4-spored. 
Spores oval to elliptical, smooth, coarsely granular, 8-12 7-8 Bb. 
Annulus very thin, membranaceous, superior, hanging from the 
extreme apex of the stem, soon disappearing. Stem hollow, with 
loose cottony threads, even in the smaller plants, tapering upward in 
the larger ones, or smaller at base, surface floccose. Volva white, 
thick, circumscissile, in dehiscence the upper part remaining on the 
center of the pileus, lower portion of limb very prominent, 2-4°™ 
long, sometimes appressed on the stem, but usually distinctly 
divergent and in age recurved, often with a distinct inner collar near 
the base, in age the stem often separating from the volva, leaving the 
latter as a saucer-shaped structure with its inner collar in the ground.— 
Mountain forests, California, in late autumn and early spring, Mrs. 
Virginia Garland Ballen. WHerb., Cornell Univ., no. 22620. 
* Science N. S. 293944. 1909. | 
Closely related to Amanita calyptrata Peck, Bull. Torr. Bot. Club 27:14. 
*909, but differs in color and other characters. 
