North American Flora: Agaricales, Agaricaceae (Vol. 10 ... - MykoWeb

PART 1, 1914] AGARICACEAE 71
7. Venenarius umbrinidiscus Murrill, Mycologia4: 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.
8. Venenarius virginianus Murrill, sp. nov.
Pileus convex to plane, small, thin, solitary to gregarious, 2-2.5 cm. broad; surface moist
to viscid, fuliginous, glabrous, margin white, long-striate; context thin, white, unchanging;
lamellae free, white, unchanging, subdistant; spores subglobose to ovoid, smooth, hyaline,
10X8.5 p; stipe cylindric and equal above, somewhat bulbous at the base, smooth, white,
glabrous, 4-5 cm. long, 5 mm. thick; annulus median, white, usually persistent; volva rather
large and distinct, white, adnate to the base of the stipe and forming a conspicuous cup.
Type collected on a moist, gravelly bank in oak woods near Mountain Lake, Virginia, 1300 m.
elevation, July 8-14, 1909, W. A. Murrill 28.
DISTRIBUTION: Mountain Lake, Virginia.
9. Venenarius Peckianus (Kauffm.) Murrill.
Amanita Peckiana Kauffm.; Peck, Mycologia 5 : 67. 1913.
Pileus at first ovoid, becoming broadly convex or nearly plane, 5-9 cm. broad; surface
glabrous at first becoming fibrillose or somewhat scurfy with minute, adnate, pinkish or cream-
colored squamules, white, not striate; margin at first incurved and bordered by the thickish
union of the universal and partial veil, at length crenate-fringed or lacerate-appendiculate;
context firm, thickish, white; lamellae free, reaching the stipe, moderately broad, much broader
in front, subellipsoid, pure-white, flocculose on the edges; spores oblong, obtuse, 12-16X5-7 M;
stipe stout, tapering upward, stuffed or hollow, bulbous, 5-9 cm. long, 1-2 cm. thick; volva
thick, firm, loose, margined with ovate lobes, the flesh often pinkish or salmon-colored, espe-
cially toward the base; veil very thin, evanescent, not forming a persistent annulus.
TYPE LOCALITY: New Richmond, Michigan.
HABITAT: Sandy soil under white pine trees.
DISTRIBUTION: Known only from the type locality.
10. Venenarius calyptratoides (Peck) Murrill, Mycologia 4: 241.
1912.
Amanita calyptratoides Peck, Bull. Torrey Club 36: 329. June, 1909.
Amanita calyptroderma Atkinson & Ballen, Ann. Myc. 7: 365. August, 1909.
Pileus fleshy, convex to nearly plane, 4-22 cm. broad, covered in the center by a single
large irregular fragment or by small fragments of the volva; surface grayish-brown or lead-
colored, sometimes ochraceous or cream-colored, margin striate; context white, of mild flavor;
lamellae adnexed, sinuate, unequal, subcrowded, white or cremeous; spores broadly ellipsoid,
smooth, hyaline, often uninucleate, usually with an oblique apiculus at one end, 8-12X6-8 ¡J.;
stipe subequal, white, striate at the top, floccose, hollow, 8-12 cm. long, 1-4 cm. thick; annulus
slight, evanescent; volva white, prominent, 2-4 cm. long.
TYPE LOCALITY: Claremont, California.
HABITAT: In groves or forests.
DISTRIBUTION: California.