Part 2, 1917] AGARICACEAE 109 
26. Pleuropus Leptonia (Peck) Murrill. 
Clitopilus Leptonia Peck, Bull. N. ¥. State Mus. 167: 39. 1913. 
Pileus thin, conic or convex, umbilicate, gregarious, 2.5-3.5 cm. broad; surface hygroph- 
anous, squamulose on and near the broad umbilicus, chestnut-colored and striatulate on 
the margin when moist, black on the umbilicus; lamellae broad, distant, white, becoming pink, 
broadly sinuate-adnate or decurrent, sometimes transversely venose; spores subglobose, 
angular, uninucleate, 10-12 X 8-10 y; stipe slender, equal or slightly narrowed upward, fibril- 
lose, straight, stuffed or hollow, brown, becoming darker with age, with a copious, white, 
mycelioid tomentum at the base, 5-8 cm. long, 1-3 mm. thick. 
TYPE LocaLity: Stow, Massachusetts. 
Hasirat: Low ground under trees. 
DISTRIBUTION: Known only from the type locality. 
27. Pleuropus sphaerosporus (Peck) Murrill. 
Clitopilus sphaerosporus Peck, Bull. Torrey Club 31: 179. 1904. 
Pileus fleshy but thin, nearly plane, umbonate or slightly depressed at the center, 1—2.5 
em. broad; surface dry, minutely tomentose-pubescent, dark-gray or blackish-brown, margin 
involute or decurved; context white; lamellae thin, narrow, crowded, unequal, slightly de- 
current, whitish, faintly tinged with pink; spores pale-pink, globose, uninucleate, 5-6 pu; stipe 
equal or slightly tapering upward, solid, firm, concolorous, with a white, mycelioid tomentum 
at the base, 2-4 cm. long, 2-4 mm. thick. 
Tyre Locatity: St. Louis, Missouri. 
Hasirat: Among fallen leaves in ravines. . 
DistRIBUTION: Known only from the type locality. 
28. Pleuropus adnatifolius Murrill, sp. nov. 
Pileus small, convex, not expanding, gregarious, 1-1.5 cm. broad; surface smooth, dry, 
glabrous, estriate, uniformly milk-white, margin entire, concolorous, incurved; lamellae 
adnate, natrow, arcuate, distant, white to pale-rose-colored, entire and concolorous on the 
edges; spores broadly ellipsoid, angular, apiculate, uniguttulate, rose-colored, 8-10 X 6-7 u; 
stipe rather slender, fleshy, solid, smooth, glabrous, white, about 3 cm. long, 2-3 mm. thick. 
Type collected in sand and gravel by the roadside at Preston’s Ravine, near Palo Alto, Cali- 
fornia, November 25, 1911, W. A. Murrill & L. R. Abrams 1199 (berb. N. Y. Bot. Gard.). 
DIstRIBUTION: Known only from the type locality. 
29. Pleuropus avellaneus Murrill, sp. nov. 
Pileus rather thin and firm, umbilicate to subinfundibuliform, regular, gregarious, abun- 
dant, 2.5-3.5 cm. broad; surface smooth, dry, glabrous, somewhat shining, uniformly avel- 
laneous; context with farinaceous taste but no odor; lamellae truly decurrent, narrow, arcu- 
ate, subcrowded, whitish-avellaneous to pinkish, entire and concolorous on the edges; spores 
oblong-ellipsoid with rounded ends, smooth, rose-colored, 7-9 X 5-6 m; stipe subfleshy with a 
cartilaginous rind, hollow, equal, often curved, smooth, glabrous, not shining, avellaneous, 
3-5 cm. long, 2-3 mm. thick. 
Type collected on the ground in a cultivated field at Seattle, Washington, October 20-Novem- 
ber 1, 1911, W. A. Murrill 412 (berb. N. Y. Bot. Gard.). 
Hasrrat: On the ground in fields or woods. 
DIstRIBUTION: Vicinity of Seattle, Washington. 
30. Pleuropus Earlei Murrill, Mycologia 3: 280. 1911. 
Chitopilus Earlei Murrill, Mycologia 4: 332. 1912. 
Pileus thin, firm, convex to subexpanded, umbilicate, gregarious, 1-2 cm. broad; surface 
pure-white, glabrous, margin entire, inrolled when young; lamellae short-decurrent, sub- 
crowded, narrow, irregular, pure-white to pink; spores angular, 7 X 5-6 y; stipe short, subequal, 
often flattened, pure-white, fistulose, minutely pruinose to glabrous, surrounded at the base 
with whitish mycelium, 2-3 cm. long, 2-3 mm. thick. 
Type LOCALITY: Santiago de las Vegas, Cuba. 
Haxsirat: On the ground in a banana field. 
DISTRIBUTION: Santiago de las Vegas, Cuba. 
