Part 2, 1917] AGARICACEAE 137 
46. Pluteus aethalus (Berk. & Curt.) Sacc. Syll. Fung. 5: 674. 
; 1887. 
Agaricus aethalus Berk. & Curt. Jour. Linn. Soc. 10: 289. 1868. 
Pileus very small, depressed around the umbo, 8 mm. broad; surface pulverulent, spadi- 
ceous; lamellae broad; spores globose, 5 4; stipe slender, concolorous, 12 mm. long, 6 mm. thick. 
TYPE Locality: Cuba. 
Hasrrat: On decayed wood. 
DISTRIBUTION: Mexico and Cuba. 
47. Pluteus myceniformis Murrill, sp. nov. 
-Pileus thin, fragile, convex, not expanding, regular, solitary, 3 cm. broad; surface gla- 
brous, smooth or slightly striate, nearly white, yellowish on the disk, margin white, incurved, 
entire to slightly lacerate; lamellae broad, subdistant, very thin and fragile, white to pale- 
salmon-colored, entire and concolorous on the edges; spores subglobose to broadly ellipsoid, 
smooth, uniguttulate, rose-colored, 8-10 X 7-8 4; stipe short, subequal, smooth, glabrous, 
white, 2-3 cm. long, 2-3 mm. thick. 
Type collected on a dead log at Cinchona, Jamaica, 1,500 m. elevation, December 25, 1908, 
W.A.& Edna L. Murrill 504 (herb. N.Y. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
48. Pluteus compressipes Murrill, sp. nov. 
_Pileus convex to subexpanded, not umbonate, gregarious, 3-4 cm. broad and 1 cm. thick; 
surface glabrous, striate, rosy-isabelline, somewhat darker on the disk, margin entire, con- 
colorous; lamellae free, of medium distance, broad, white to salmon-colored; spores globose to 
subglobose, smooth, rose-colored, 6-8 u; stipe slender, tapering upward, compressed, smooth, 
glabrous, white, attached by a white mat of mycelium, 3 cm. long, 2~3 mm. thick. 
Type collected on dead wood in Castleton Gardens, Jamaica, December 15, 1908, W. A. & Edna 
L. Murrill 118 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Known only from the type locality. 
49. Pluteus pulverulentus Murrill, sp. nov. 
Pileus thin, convex to expanded, obtuse, solitary, 2-3 cm. broad; surface dark-brown, 
glabrous and rugose-reticulate on the disk, brown-pulverulent on the margin, not striate; 
lamellae free, subcrowded, broad, ventricose, white to salmon-colored, entire and concolorous 
on the edges; spores globose, minute, smooth, rose-colored, 5 u; stipe cylindric, glabrous, 
subconcolorous, 2 cm. long, 2 mm. thick. 
Type collected on the ground in shade at The Bower, St. George’s, Grenada, West Indies, 
September 10, 1905, W. E. Broadway (herb. N. Y. Bot. Gard.). 
DIstRIBUTION: Known only from the type locality. 
50. Pluteus multistriatus Murrill, Mycologia 3: 277. 1911. 
Pileus convex, depressed about the umbo, somewhat clustered, 3 cm. broad; surface 
fuliginous, subglabrous, with numerous shallow furrows, or striations, extending from the 
umbo to the margin; lamellae free, close, broad, pallid; spores globose or subglobose, smooth, 
uninuculeate, 5-7 u; cystidia none; stipe slender, equal, glabrous, white, 4 cm. long, 2-3 mm. 
thick. 
Type Locauity: Jalapa, Vera Cruz, Mexico. 
Hapirat: On a decayed railway tie. a 
DIsTRIBUTION: Known only from the type locality. 
51. Pluteus jamaicensis Murrill, Mycologia 3: 278. 1911. 
Pileus thin, expanded, obtuse, subcespitose, 2-3 cm. broad; surface dark-brown, paler 
with age, rugose, crustose-areolate, not striate; lamellae free, subcrowded, broad, ventricose, 
white to pink; spores globose, smooth, 4 »; cystidia none; stipe white, enlarged above and below, 
solid, glabrous expect at the base, which is conspicuously whitish-tomentose, 2 cm. long, 
2 mm. thick. 
Type LocaLity: Castleton Gardens, Jamaica. 
Hasirat: On rotten wood. . 
DISTRIBUTION: Known only from the type locality. 
