Part 3, 1917] AGARICACEAE 149 
III. SPEcIES CONFINED To TROPICAL NoRTH AMERICA 
Pileus 2-10 mm. broad. 
Pileus floccose-pulverulent, pure-white. 29. C. parvulus. 
Pileus glabrous. 
Pileus 2-5 mm. broad. 
Surface russet-white or isabelline. 
Stipe inconspicuous, fugacious. 30. C. Citri. 
Stipe conspicuous, persistent. 31. C. eccentricus. 
Surface chrome-yellow. 32. C. Dussii. 
Pileus 5-10 mm. broad. 
Pileus pale-ochraceous. 33. C. Psychotriae. 
. Pileus testaceous to latericious. 34. C. bicolor. 
ae 1-3 cm. broad, sometimes smaller in C. cuneiformis and C. subcunei- 
‘ormis. 
Pileus white or whitish. 
Pileus striate on the margin. 
Margin very thin, pellucid, becoming dark on drying. 35. C. cinchonensis. 
Margin not as above. 36. C. sulcatus. 
Pileus not striate on the margin. 
Pileus about 1 cm. broad. 37. C. musaecola. 
Pileus 2-3 cm. broad. 38. C. fumosifolius. 
Pileus yellowish, isabelline, ochraceous, or melleous. 
Pileus about 1 cm. broad. 
Surface glabrous or nearly so. 
Pileus sessile. 39. C. subcuneiformis, 
Pileus attached by a dark-reddish-brown stipe. 40. C. substipitatus. 
Surface squamulose. 41. C. caceophyllus. 
Pileus 3 cm. broad, decorated with minute, conic elevations. 42. C. calolepidoides. 
Pileus ochraceous-red, pulverulent, deeply lacerate. 43. C. laceratus, 
Pileus rufous, glabrous, not lacerate, although sometimes lobed. 44. C. pyrrhus. 
Pileus pale-brown or watery-brown. 
Pileus 8-12 mm. broad; lamellae serrulate. 45. C. cuneiformis. 
Pileus 1—2.5 cm. broad; lamellae not serrulate. 46. C. aquosus. 
1. Crepidotus latifolius Peck, Bull. Torrey Club 26: 66. 1899. 
Pileus very thin, submembranous, sessile, suborbicular, gregarious, 3-6 mm. broad; 
surface hygrophanous, striatulate when moist, white and slightly pubescent when dry; con- 
text white; lamellae very broad, suborbicular, 5 or 6 times as wide as the thickness of the 
context, subdistant, extending beyond the margin of the pileus, white, becoming pale-ferru- 
ginous with age; spores globose, 5-6 » in diameter. 
TYPE LOCALITY: Ohio. 
Hasitar: On much decayed wood. . 
DistRiBvUTION: Known only from the type locality. 
2. Crepidotus albidus Ellis & Ev. Proc. Acad. Phil. 1894: 322. 
1894. 
Pileus resupinate-sessile, 5~7.5 mm. broad; surface glabrous, whitish, margin incurved 
when dry; lamellae radiating from a lateral point, not crowded, thin, broad, pallid to yellowish- 
brown; spores unequally ellipsoid, yellowish-brown, 5 X 3.5 yu. 
TyPE Locatiry: Ann Arbor, Michigan. 
Hastirart: On linden logs. ; 
DISTRIBUTION: Known only from the type locality. 
3. Crepidotus herbarum (Peck) Sacc. Syll. Fung. 5: 888. 1887. 
Agaricus herbarum Peck, Bull. Buffalo Soc. Nat. Sci. 1: 53. 1873. 
Pileus thin, resupinate, suborbicular, sometimes becoming reflexed, sessile, dimidiate, 
4-10 mm. broad; surface white, clothed with a white, downy villosity, becoming less downy 
with age, margin incurved when young; lamellae rather narrow, subdistant, radiating from a 
naked lateral or eccentric point, white, becoming subferruginous; spores ellipsoid, 6-7.5 
K 3-4 yw. 
Type LocaLity: North Greenbush, New York. : 
Hasirat: On dead stems of herbs and dead wood of deciduous trees. . 
DisTRIBuTION: Temperate North America south to New York and west to Washington and 
California. 
