Part 2, 1917] AGARICACEAE 107 
17. Pleuropus magnisporus Murrill, sp. nov. 
Pileus small, irregular, convex to depressed, cespitose or gregarious, reaching 2 cm. broad; 
surface dry, subglabrous, not polished, uneven, not striate, uniformly very pale avellaneous, 
margin concolorous, irregular, often lacerate; lamellae adnate to short-decurrent, plane, rather 
broad and distant, white to salmon-colored; spores very large, oblong-ellipsoid, nodulose or 
‘slightly angular, more or less truncate, uniguttulate, rose-colored, 14-16 X 8~9 u; stipe short, 
tapering downward, smooth, glabrous, fleshy, pallid, 1 cm. long, 2-4 mm. thick. 
Type collected on a manured lawn at Lake Placid, Adirondack Mountains, New York, July 
17-29, 1912, W. A. & Edna L. Murrill 49 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
18. Pleuropus unitinctus (Peck) Murrill. 
Agaricus unitinctus Peck, Ann. Rep. N. Y. State Mus. 38: 86. 1885. 
Clitopilus unitinctus Sacc. Syll. Fung. 5: 705. 1887 
Pileus thin, submembranous, flexible, convex or nearly plane, centrally depressed or um- 
bilicate, 1-3.5 cm. broad; surface glabrous, subshining, often concentrically rivulose, grayish 
or grayish-brown; context whitish or grayish-white, the odor obsolete, the taste mild; lamellae 
narrow, moderately crowded, adnate or slightly decurrent, concolorous; spores ellipsoid, 
7.5 X 5p; stipe slender, straight or flexuous, subtenacious, equal, slightly pruinose, grayish- 
brown, with a close, white, mycelioid tomentum at the base and white, root-like fibers of 
mycelium penetrating the soil, about 2.5 cm. long and 2 mm. thick. 
TYPE LocaLity: Karner, New York. 
Hasrirat: In woods of pine or balsam. 
DistRIBuTION: Northern New York. 
19. Pleuropus socialis (Peck) Murrill. 
Clitopilus socialis Peck, Bull. N. Y. State Mus. 5: 648. 1899. 
Pileus thin, convex, deeply umbilicate, closely gregarious, 1-2 cm. broad; surface grayish- 
brown; lamellae thin, moderately crowded, decurrent, concolorous when young, grayish- 
-incarnate when mature; spores irregular, uninucleate, subglobose, 7.5-10 X 6-7.5 »; stipe equal, 
stuffed or hollow, concolorous or a little paler, 1.2-2.5 cm. long, 2-4 mm. thick. 
Type Locaiiry: Delmar, New York. 
Hasitat: Under pine and hemlock trees. 
DIsTRIBUTION: Known only from the type locality. 
20. Pleuropus micropus (Peck) Murrill. 
Agaricus micropus Peck, Ann. Rep. N. Y. State Mus, 31: 33. 1879, 
Clitopilus micropus Sace. Syll. Fung. 5: 705. 1887. 
Pileus thin, fragile, convex or centrally depressed, umbilicate, 1.2-3.5 em. broad; surface 
silky, gray, often with one or two narrow zones on the margin; context having a farinaceous 
taste and odor; lamellae rather narrow, crowded, adnate or slightly decurrent, gray, becoming 
salmon-colored with age; spores angular, uninucleate, salmon-colored, 7.5-10 X 6—-7.5 x; stipe 
short, solid or with a slight cavity, often slightly thickened at the apex, pruinose, gray, with a 
white, mycelioid tomentum at the base, reaching 2.5 cm. long, 2-4 mm. thick. 
TypH LocaLity: Ticonderoga, New York. 
Haprrat: On the ground under trees. 
DISTRIBUTION: Vermont and New York. 
ILLUSTRATIONS: Bull. N. Y¥. State Mus. 10: 1. 78, f. 1-12. 
21. Pleuropus squamulosus (Peck) Murrill. 
Clitopilus squamulosus Peck, Bull. N. Y. State Mus. 105: 16. 1906. 
Pileus thin, nearly plane, deeply umbilicate, 2.5-3.5 cm. broad; surface floccose-squamu- 
lose, especially at the center, grayish-brown and shining; context whitish; lamellae crowded, 
adnate or slightly decurrent, tinged with flesh-color; spores subquadrate, angular, flesh- 
colored, 12.5 » broad, with a large shining nucleus; stipe long, slightly tapering upward, hollow, 
