354 NORTH AMERICAN FLORA 
Pileus 1.5—2 cm. broad. 
Pileus cremeous-melleous, umbilicate. 
Pileus isabelline with a fulvous umbo. 
Pileus 2.5-6 cm. broad. 
Lamellae denticulate. 
Lamellae not denticulate. 
Lamellae white, not changing. . 
Jamellae yellow, changing to brownish-red on drying. 
Pileus some shade of fulvous, bay, or reddish-brown. 
Pileus with a distinct, conic umbo. 
Stipe radicate, 5-15 cm. long. 
Stipe not radicate, 4-5 cm. long. 
Pileus convex or broadly umbonate. 
Stipe glabrous. 
Stipe 2-2.5 cm. long; pileus cespitose. 
Stipe 2.5-5 cm. long; pileus usually solitary or gregarious. 
Spores ellipsoid. ~ 
Spores subglobose. 
Stipe distinctly velvety. 
Pileus distinctly viscid. 
Pileus not viscid. 
Pileus avellaneous, fuliginous, or blackish. 
Pileus umbilicate. 
Pileus convex. 
Pileus avellaneous; stipe 5 cm. long. 
Pileus fuliginous; stipe 2 cm. long. 
62. 
63. 
64. 
65. 
23. 
66. 
67. 
68. 
36. 
69. 
31. 
70. 
40. 
71. 
72. 
III. SpEcrES OCCURRING IN TROPICAL NorTH AMERICA 
Pileus glabrous, not viscid. 
Pileus white or whitish, sometimes differently colored on the disk. 
Pileus entirely white. 
Pileus 1-2 em. broad. 
Pileus 3-8 cm. broad. 
Lamellae deeply sinuate, narrow, crowded. 
Lamellae adnate, broad. 
Pileus white, differently colored on the disk. 
Disk pale-yellowish; stipe 1.5 em. long. 
Disk latericious; stipe 6 cm. long. 
Pileus ochraceous, isabelline, or fulvous. (G. dryophilus, a temperate 
aia found at high elevations in the tropics, may be looked for 
ere.) 
Pileus pale-ochraceous, 5~10 mm. broad. 
Pileus dark-ochraceous, 1-3 cm. broad. 
Pileus isabelline with a pale-latericious umbo, 5 cm. broad. 
Pileus fulvous. 
Lamellae white. 
Stipe 2-3 cm. long; pileus becoming fuliginous on drying. 
Stipe 1 cm. long; pileus remaining fulvous on drying. 
Lamellae brown. 
Pileus blue. 
Pileus avellaneous. 
Lamellae white. 
Pileus pale-avellaneous. 
Pileus reddish-brown. 
Lamellae pale-murinous. 
Pileus fuliginous. 
Pileus rosy-livid or dark-red. 
Pileus rosy-livid, 12 mm. broad. 
Pileus latericious, 7 mm. broad. 
Pileus bay to dark-reddish-brown, 2.5—-5 cm. broad. 
Species wood-loving; margin striate. 
Species growing on the ground; margin estriate. 
Pileus decorated with hairs or scales or, if glabrous, then distinctly viscid. 
Pileus viscid, tawny or reddish-yellow, cespitose. 
Pileus not viscid but decorated with hairs or scales. 
Surface white with a floccose, subseparable pellicle. 
Surface fuliginous, isabelline on the disk, beset with minute bristles. 
Surface orange, densely furfuraceous-velvety. 
Surface ochraceous to yellowish-red, becoming bay or chestnut, 
densely tomentose when young. 
1. Gymnopus delicatellus (Peck) Murrill. 
Agaricus (Collybia) delicatellus Peck, Ann. Rep. N. Y. State Mus. 30: 39. 
Collybia delicatella Sacc. Syll. Fung. 5: 224. 1887. 
32. 
G. 
G. 
G. 
G. 
G. exsculptus. 
ag 
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cremeimelleus. 
fulvidiscus. 
denticulatus. 
subrugosus. 
umbonatus. 
badiialbus. 
. avellaneidiscus. 
. dryophilus. 
. sublatericius. 
velutipes. 
fulvipes. 
MIGUTUS. 
avellaneigriseus. 
griseifolius. 
musicola. 
. Boryanus. 
. albidulus. 
. orizabensis. 
. oculatus. 
. marasmiiformis. 
. domesticus. 
. monticola. 
nigritiformis. 
densifolius. 
fimetarius. 
. cyanocephalus. 
cinchonensis. 
subnivulosus. 
subavellaneus. 
nigrita. 
roseilividus. 
xuchilensis. 
jamaicensis. 
dryophilus. 
velutipes. 
subflavescens. 
setulosus. 
chrysopeplus. 
lenuipes. 
Pileus submembranous, convex or broadly campanulate, gregarious or subcespitose, 4-6 
mm. broad; surface glabrous, pure-white: lamellae white, narrow but not crowded, emarginate: 
