Part 5, 1916] AGARICACEAE 373 
88. Gymnopus nigrita (Berk. & Curt.) Murtrill. 
Agaricus (Collybia) nigrita Berk. & Curt. Jour. Linn. Soc. 10: 285. 1868. 
Collybia nigrita Sacc. Syll. Fung. 5: 225. 1887. 
Collybia irrorata Pat. in Duss, Enum. Champ. Guad. 49. 1903. 
Pileus hemispheric with a slight umbo, very concave below, gregarious or cespitose, 
1.5-2.5 cm. broad, 7 mm. high; surface pulverulent to glabrous, rugose at times, hygrophanous, 
grayish-white to fuliginous, blackening on drying, margin entire, concolorous, incurved 
when young: lamellae adnate, narrow, crowded, dull-grayish-white, blackening on drying: 
spores broadly ellipsoid or subglobose, smooth, hyaline, 5-6 X 4.5-5.5 u: stipe cylindric, 
equal, fibrillose, concolorous, 4-5 em. long, 1-2 mm. thick. 
TYPE Locality: Cuba. 
Hasirat: On dead wood. 
DISTRIBUTION: Cuba, Jamaica (to 900 m.), Grenada, Guadeloupe, and eastern Mexico. 
89, Gymnopus roseilividus Murrill, sp. nov. 
Pileus convex-hemispheric, with a slight rounded umbo, solitary, 12 mm. broad; surface 
smooth, glabrous, hygrophanous, rosy-livid, margin undulate, somewhat darker, not striate: 
lamellae adnate, arcuate, rather broad, distant, grayish-white: spores ellipsoid, smooth, 
hyaline, 5 X 3y: stipe tapering upward, tough, smooth, glabrous, concolorous, 2 cm. long, 
1 mm. thick at the apex, 2 mm. at the base. 
Type collected on a dead fallen stick under trees at Orizaba, Mexico, 1200 m. elevation, January 
10-14, 1910, W. A. & Edna L. Murrill 810 (berb. N. VY. Bot. Gard.). 
DiIsTRIBUTION: Known only from the type locality. 
90. Gymnopus xuchilensis Murrill, sp. nov. 
Pileus conic to convex, not expanding, solitary, 7 mm. broad; surface smooth, glabrous, 
latericeous, margin slightly irregular, concolorous: lamellae adnexed, crowded, rather broad, 
stramineous: stipe slightly tapering upward, smooth, glabrous, amber-colored, whitish-myce- 
lioid at the base, 1 cm. long, 1-1.5 mm. thick. 
Type collected on decayed wood in a coffee plantation at Xuchiles, near Cordoba, Mexico, 
400-600 m. elevation, January 17, 1910, W. A. & Edna L. Murrill 1135 (herb. N. Y. Bot. Gard.). 
DistTrRIBurIon: Known only from the type locality. 
91. Gymnopus jamaicensis Murrill, sp. nov. 
Pileus convex, subcespitose, reaching 3 cm. broad; surface moist, glabrous, dark-reddish- 
brown, becoming paler on drying, margin entire, concolorous, faintly striate: context thin, 
whitish, the taste mild; lamellae adnexed, narrow, crowded, pallid: stipe- cylindric, equal, 
pruinose to glabrous, pallid, hollow, 4-6 cm. long, 3 mm. thick. 
Type collected on an ants’ nest at Castleton, Jamaica, October 28, 1902, F. S. Earle 221 (herb. 
N. Y. Bot. Gard.). i 
DISTRIBUTION: Known only from the type locality. 
92. Gymnopus subflavescens Murrill, sp. nov. 
Pileus convex to expanded, gregarious, 1-2 cm. broad; surface white, with a floccose, 
subseparable pellicle, becoming yellow on drying, margin entire, striate: lamellae adnate, 
crowded, rather narrow, white, becoming yellowish: spores globose, smooth, hyaline, 3-4.5 u: 
stipe cylindric, very slender, white, pruinose to glabrous, 2-3 cm. long, 1 mm. thick. 
Type collected on dead wood at Castleton, Jamaica, October 28, 1902, F. S. Earle 255 (herb. 
N. Y. Bot. Gard.). 
DistRIBUTION: Jamaica, at low elevations. 
93. Gymnopus setulosus Murrill, sp. nov. 
Pileus irregularly conic to convex, truncate, solitary, 16 mm. broad and 6 mm. high; 
surface uneven, rugose, dry, fuliginous, isabelline on the disk, entirely and thickly beset with 
minute, white or brownish bristles, margin undulate, slightly incurved, concolorous: lamellae 
adnate to a collar, distant, rather broad, pure-white: spores globose, smooth, hyaline, granular, 
