Part 5, 1916] AGARICACEAE 363 
TYPE Locality: Auburn, Alabama. 
HasitaT: On humus or dead wood in moist, shaded places. 
DistRisuTION: New York, Tennessee, Alabama, and Mississippi. 
ILLUSTRATION: Mycologia 3: pl. 49, f. 7. 
38. Gymnopus myriadophyllus (Peck) Murrill. 
Agaricus (Collybia) myriadophyllus Peck, Bull. Buffalo Soc. Nat. Sci. 1:47. 1873. 
Collybia myriadophylia Sace. Syll. Fung. 5: 236. 1887. 
Pileus very thin, broadly convex, plane or centrally depressed, sometimes umbilicate, 
scattered or somewhat cespitose, 1.5-2.5 cm. broad; surface hygrophanous, brown when 
moist, pale-ochraceous or tan-colored when dry: lamellae very numerous, narrow, linear, 
crowded, rounded behind or slightly adnexed, brownish-lilac: spores minute, broadly ellipsoid, 
3-4 X 2.5 w: stipe slender, but commonly short, equal, glabrous, stuffed or hollow, reddish- 
brown, 2.5—3.5 em. long, 1 mm. thick. 
TYPE LOCALITY: Portville, New York. 
HapitaT: On decaying wood and mossy humus in woods. 
DISTRIBUTION: New York; reported from Massachusetts, Ohio, and Wisconsin. 
39. Gymnopus atratoides (Peck) Murrill. 
Agaricus (Collybia) atratoides Peck, Ann. Rep. N. Y. State Mus. 32: 27. 1880. 
Collybia atratoides Peck, Ann. Rep. N. Y. State Mus. 49:53. 1897. 
Pileus thin, convex, subumbilicate, gregarious or subcespitose, 1.2-2 em. broad; surface 
glabrous, hygrophanous, blackish-brown when moist, grayish-brown and shining when dry: 
lamellae rather broad, subdistant, adnate, grayish-white, often transversely veiny above and 
venosely connected: spores nearly globose, about 5 yw: stipe equal, hollow, glabrous, grayish- 
brown with a whitish mycelioid tomentum at the base, about 2.5 cm. long, 1-2 mm. thick. 
TYPE LOCALITY: Gansevoort, New York. 
Hasitat: On decaying wood and mossy sticks in woods. 
DISTRIBUTION: Maine and New York. 
40. Gymnopus maurus (Fries) Murrill. 
Agaricus maurus Fries, Syst. Myc. 1: 168. 1821. 
Omphalia maura P. Karst. Bidr. Finl. Nat. Folk 32: 127. 1879. 
Pileus thin, umbilicate, gregarious, 1.5-3 em. broad; surface glabrous, hygrophanous, 
somewhat striate, dark-avellaneous, paler when dry, margin incurved when young, entire, 
concolorous: lamellae adnate or slightly decurrent, crowded, ashy-white, arcuate: spores 
ellipsoid, smooth, hyaline, 5-7 3-4 u: stipe short, rigid, subequal, smooth, glabrous, con- 
colorous, 2.5-5 cm. long, 1-2 mm. thick. 
Type LocaLity: Europe. 
Hastrrat: In sandy soil, usually on burnt ground or on charcoal. 
DISTRIBUTION: New England, New York, and west to Washington; also in Europe. 
ILLusrration: Fries, Ic. Myc. pl. 73, f. 2. 
41. Gymnopus detersibilis (Berk. & Curt.) Murrill. 
Agaricus (Collybia) detersibilis Berk. & Curt. Ann. Mag. Nat. Hist. II. 12: 419. 1853. 
Collybia detersibilis Sacc. Syll. Fung. 5: 247. 1887. 
Pileus plane, umbilicate, gregarious to subcespitose, 12-25 mm. broad; surface glabrous, 
whitish to subfuliginous, margin striatulate: lamellae adnate, crowded, whitish: stipe pruinose, 
concolorous, fulvous at the base, contorted, compressed, dilated above, solid, 2.5 em. or more 
long, 2 mm. thick. 
Tyre Locality: South Carolina. _ 
Hasrrat: On grass roots in sandy soil. ; 
DistrrsuTion: North Carolina and South Carolina. 
42. Gymnopus expallens (Peck) Murrill. 
Collybia expallens Peck, Ann. Rep. N. Y. State Mus. 44: 130 (18). 1891. 
Pileus thin, broadly convex or nearly plane, sometimes centrally depressed, 2.5-5 cm. 
broad; surface glabrous, hygrophanous, brownish when moist, whitish when dry, margin thin, 
