128 NORTH AMERICAN FLORA [VorumME 10 
. II. Species occURRING ON THE PaciFic coast 
Pileus 2-5 em. broad. 
Stipe 2-7 cm. long, 2-5 mm. thick. 
Surface greenish-gray, becoming cinnamon-gray. 38. P. californicus. 
Surface avellaneous-isabelline, tomentose. 39. P. latifolius. : 
_ Surface avellaneous-umbrinous, glabrous. 40. P. washingtonensis. 
Stipe 9 cm. long, 10 mm. thick. 41. P. fulvibadius. 
Pileus 6-10 cm. broad. 36. P. cervinus. 
Pileus 10-20 em. broad. 42, P. magnus. 
TIT. SPECIES OCCURRING IN TROPICAL Nor?TH AMERICA 
Pileus about 1 cm. or less broad. . 
Surface white, covered with soft, black hairs. 43. P. tephrostictus. 
Surface reddish-white, glabrous. 44, P. alborubellus. 
Surface orange-red. 45. P. laetifrons. 
Surface date-brown. 46. P. aethalus. 
Pileus 2-3 em. broad, reaching 4 cm. in P. compressipes. . F 
Surface whitish, yellowish on the disk. 47. P. myceniformis. 
Surface rosy-isabelline, slightly darker on the disk. 48. P. compressipes. 
Surface dark-brown or fuliginous, rarely varying to olivaceous. 
Stipe brownish, 2 cm. long, 2 mm. thick. 49. P. pulverulentus. 
Stipe white. 
Surface of pileus glabrous. . 
Surface striate. 50. P. multistriatus. 
Surface rugose, not striate. 51. P. jamaicensis. 
Surface of pileus floccose or finely asperate. 
Stipe 1-3 em. long; pileus fuscous-brown or olivaceous. 52. P. nitens. 
Stipe 3—4 cm. long; pileus pale-fuliginous to dark-chestnut. 53. P. Harrisii. 
Pileus 4-5 em. broad. 
Stipe 3-5 mm. thick. 
Surface of pileus glabrous, smooth. \ 54, P. spinulosus. 
Surface of pileus velvety, reticulate. 55. P. reticulatus. 
Stipe 10 mm. or more thick. 56. P. rimosus. 
Pileus 6-10 cm. broad. 
Surface densely floccose, uniformly pale-yellow. 57, P. Earlei. 
Surface subglabrous, not colored as above. 36. P. cervinus. 
1. Pluteus niveus Murrill, sp. nov. 
Pileus thin, expanded, 2 cm. broad; surface minutely furfuraceous, white, margin not 
striate; lamellae free, subcrowded, broad, ventricose, white to pale-pink; spores broadly 
ellipsoid, 8 X 6 »; stipe cylindric, glabrous, shining, white, solid, 5 cm. long, 2 mm. thick. 
e ayer collected at West Park, New York, August 3, 1903, F. S. Earle 1698 (herb. N. Y. Bot. 
ard.). 
DIstRIBUTION: Known only from the type locality. 
2. Pluteus sterilomarginatus Peck, Ann. Rep. N. Y. State Mus. 
38: 136. 1885. 
Agaricus sterilomarginatus Peck, Bull. Buffalo Soc. Nat. Sci. 1: 48. 1873. 
Pileus thin, broadly convex or expanded, 1.2-2.5 em. broad; surface covered with a 
minute, close-pressed tomentum, pinkish-white, margin thin, projecting beyond the lamellae; 
lamellae crowded, subventricose, minutely eroded on the edges, tapering toward the outer 
extremity, pale-flesh-colored; spores subglobose, angular, usually containing a single central 
nucleus, 6»; stipe short, equal, solid, glabrous, straight or curved, whitish, about 2.5 cm. 
long, 1-2 mm. thick. 
Tyre Locattiry: Portville, New York. 
Hasirat: On decaying wood and sticks in woods. 
DISTRIBUTION: Massachusetts, New York, and Virginia. 
3. Pluteus roseocandidus Atk. Ann. Myc. 7: 373. 1909. 
Pileus convex to expanded, upturned with age, gregarious, 2-3 cm. broad; surface pure- 
white, showing a tint of rose in wet weather, smooth, margin striate, thin; lamellae pure- 
white, becoming rose-colored, elliptic, not very crowded, very slightly adnexed, rounded 
behind; spores globose or subglobose, pale-flesh-colored, coarsely granular, smooth, 7-8 y; 
stipe even, smooth, fibrous-striate, slightly mealy at the apex, hollow, fragile, hairy at the 
base, sometimes compressed, 3-4 cm. long, 3-4 mm. thick. 
Typz LocaLity: Cascadilla woods, Ithaca, New York. 
Hasirat: On grassy ground. 
DISTRIBUTION: Known only from the type locality. 
