Parr 2, 1917] AGARICACEAE 105 
DiIstTRIBUTION: Canada to Alabama and west to Wisconsin; also in Europe. 
ILLUSTRATIONS: Ann. Rep. N. Y. State Mus. 48: gl. 14, f. 1-6; Atk. Stud. Am. Fungi ed. 1. 
f, 135; ed. 2. f. 138; Cooke, Brit. Fungi pl. 322 (343); Fries, Sv. Aetl. Svamp. pl. 19; Gill. Champ. 
Fr. pl. 270 (146); Hard, Mushr. f. 200; Hussey, Ill. Brit. Myc. 2: pl. 47; Schaeff. Fung. Bavar. pl, 
78 (as Agaricus albellus); Sow. Engl. Fungi pl. 143. 
a, cae feu PTT de Hutpilze 21, 40; Rav. Fungi Car. 1: 2 (as Agaricus carneo-albus); 
8. Pleuropus obesus (Batsch) Murrill. 
Agaricus obesus Batsch, Hlench. Fung. Contin. 2: 89. 1789. 
Agaricus orcellus Bull. Champ. Fr. pl. 573, f. 1; hyponym. 1791; Pers. Syn. Fung. 473. 1801. 
Clitopilus orcellus Quél. Champ. Jura Vosg. 87. 1872. 
Pileus fleshy, soft, plane or slightly depressed, often irregular, 5-10 em. broad; surface 
even when young, slightly silky, somewhat viscid when moist, white or yellowish-white; 
context white, the taste and odor farinaceous; lamellae deeply decurrent, crowded, whitish, 
becoming flesh-colored; spores ellipsoid, 8.5-10 X 5 y; stipe short, solid, flocculose, often ec- 
centric, white, thickened at the apex, 2-6 cm. long, 5-8 mm. thick. 
Type LocaLiry: Europe. 
Hasitat: In pastures and open places. 
Distripution: Canada to Alabama in the eastern United States; also in Europe. 
ILLUSTRATIONS: Ann. Rep. N. Y. State Mus. 48: pl. 14, f. 7-11; Batsch, Elench. Fung, f. 216; 
Bull. Herb. Fr. pl. 573, f. 1; Cooke, Brit. Fungi pl. 323 (344); Fries, Sv. Aetl. Svamp. gi. 20; Gill. 
Champ. Fr. pl. 271 (145); Hard, Musbr. f. 201; Hussey, Il. Brit. Myc. 1: pf. 78; Pat. Tab. Fung. 
1: f. 427; Vitt. Descr. Funghi Mang. 1. 12, f. 2. 
Exsiccati: Sydow, Myc. Mar. 1002. 
9. Pleuropus noveboracensis (Peck) Murrill. 
Agaricus noveboracensis Peck, Ann. Rep. N. ¥. State Cab. 23: 89. 1872. 
Clitopilus noveboracensis Sacc. Syll. Fung. 5: 702. 1887. 
Pileus thin, convex, becoming expanded or slightly depressed, gregarious or cespitose, 
2.5-5 cm. broad; surface rimose-areolate or concentrically rivulose, sometimes obscurely zonate, 
dingy-white, the disk often tinged with reddish-yellow or rusty hues when moist, margin often 
undulate, clothed when fresh and moist with a film of interwoven, webby, white fibrils; con- 
text having a farinaceous odor and a bitter, unpleasant taste; lamellae narrow, crowded, 
adnate to deeply decurrent, some of them forked, white, becoming dingy, tinged with yellow 
or flesh-color; spores globose, 4-5 yu; stipe equal, solid, concolorous, the mycelium white, often 
forming white, branching, root-like fibers, 2.5-5 cm. long, 2-6 mm. thick. 
Type Locauiry: North Elba, New York. 
Hasirat: In woods and pastures. 
DISTRIBUTION: Maine to North Carolina and west to Ohio. 
ILLUSTRATION: Hard, Mushr. f. 204. 
; 10. Pleuropus Seymourianus (Peck) Murrill. 
Agaricus Seymourianus Peck, Ann. Rep. N. Y. State Mus. 24: 66. 1872. 
Clitopilus Seymourianus Sacc. Syll. Fung. 5: 703. 1887. 
Pileus fleshy, thin, broadly convex or slightly depressed, 2.5—-6.5 cm. broad; surface even, 
pruinose, whitish with a dark-lilac tint, margin sometimes lobed; lamellae narrow, crowded, 
decurrent, some of them forked at the base, whitish with a pale-flesh-colored tint; spores 
minute, globose or nearly so, 3-4 » long; stipe equal, silky-fibrillose, hollow,. 3.5-6.5 cm. long, 
6-12 mm. thick. 
Type LocaLiry: Greig, New York. 
Hasirat: In woods. : 
DIstTRIBUTION: Known only from the type locality. 
11. Pleuropus depressus (Clements) Murrill. 
Orcella depressa Clements, Bot. Surv. Neb. 4: 21. 1896. 
Clitopilus depressus Sacc. Syll. Fung. 14: 128. 1899. 
Pileus plano-convex or depressed at the center, submembranous, 0.7-1.5 cm. broad; 
surface glabrous, even, ochraceous, darker at the center; lamellae decurrent, subdistant, 
