Part 1, 1914] 



AGARICAC3A3 



5 



1 Surface of pileus mostly some shade of yellowish-brown or brown. 

 Lamellae white, unchanging. 



Pileus thin, hygrophanous, often splitting at the margin. 

 Pileus not as above. 



Lamellae becoming orange when bruised; pileus 2.5-5 cm. 

 broad. 



Lamellae not becoming orange when bruised; pileus 4—12 

 cm. broad. 



Pileus subcespitose; spores ellipsoid, 5-6 X2-3 /z. 

 Pileus usually cespitose ; spores globose, 6 fx. 

 Pileus not Cespitose; spores oblong, 7-8 X3 fi. 

 Lamellae whitish, at length ochraceous; pileus grayish-tawny, 

 12-20 cm. broad. 



Lamellae cinereous, becoming dark-brown or blackish with age or 

 on drying. 



Spores oblong-ellipsoid, 7.5 X4 /a; species known only from 



New York. 

 Spores subglobose, 6-7.5 /*; species known only from Alabama. 

 Lamellae yellow; pileus only 12 mm. broad. 

 Surface of pileus mostly some shade of gray or black. 

 Lamellae white, unchanging. 



Stipe slender, less than 1 cm. thick. 

 Stipe at least twice as thick. 



Taste disagreeable; spores 5-7 X2— 3 /*. 

 Taste pleasant; spores 7-9X5-6^. 

 Lamellae whitish or yellowish, slightly changing at times ; stipe short. 

 Pileus avellaneous at the center, fading out to nearly white at 



the margin. 

 Pileus grayish-brown to blackish-brown, margin concolorous; 

 taste acrid. 

 Lamellae whitish tinged with blue; pileus small, blackish-brown. 

 Lamellae avellaneous to umbrinous. 



Lamellae avellaneous with a murinous tint; stipe about 5 mm. 



thick. 

 Lamellae pale -avellaneous, becoming smoky-umbrinous ; stipe 

 about 10 mm. thick. 

 Surface variegated with grayish -tan, brownish, and pinkish-lilac areas; 

 stipe white tinged with lilac; lamellae white to discolored. 

 Surface of pileus distinctly viscid and often conspicuously decorated. 

 Surface glabrous. 



Pileus white, at times slightly yellowish at the center. 

 Lamellae white, scarcely changing on drying. 

 Lamellae pallid, becoming avellaneous or subfuliginous on 

 drying. 

 Pileus brownish -yellow at the center, with a broad, white margin. 

 Pileus greenish-yellow ; spores 5 X4 ji. 



Pileus pale-alutaceous ; spores 3 fi. 



Pileus pale-pink or rose-red, slightly yellowish at times. 



Pileus light-pinkish -brown to dark-brown; lamellae white stained 



with reddish. 

 Pileus yellowish-tawny, tawny-red, or reddish-brown. 

 Lamellae white, unchanging. 



Lamellae whitish or yellowish, becoming dingy or reddish- 

 spotted with age. 

 Pileus fuliginous or purplish^gray ; stipe white. 

 Surface fibrillose or squamose. 



Lamellae white, becoming discolored or spotted with age; pileus 



tawny-red to tawny-orange. 

 Lamellae sulfur-yellow, unchanging; pileus pale-yellowish tinged 



with red. 

 Lamellae white or pale-yellow, unchanging; pileus not as above. 

 Pileus reaching 13 cm. broad, densely gregarious, yellowish- 

 brown. 

 Pileus 6-8 cm. broad, gray, with black fibrils arranged in lines. 

 Pileus reaching 4 cm. broad, usually with greenish tints. 



Disk sooty-brown, very distinct from the broad, paler 



margin; stipe white. 

 Disk not nearly so distinct as above; stipe mostly tinged 



with yellow or green. 

 Pileus conic or convex, usually lobed at the margin. 

 Pileus convex to expanded, margin entire. 



II. Species occurring on the Pacific coast 



Surface of pileus dry and glabrous. 



Sporophore with slender stipe and thin, variously colored pileus, re 



sembling Collybia. 

 Sporophore not as above. 



Surface of pileus mostly white or whitish, rarely darker on the disk. 



Pileus 2-5 cm. broad. 



Pileus 2 cm. or less broad; stipe 4 cm. long, 2 mm. thick. 



54. M. rimosa. 



55. M. submaculata. 



56. M. eduriformis, 



57. M. lugubris. 



58. M. niveipes. 



59. M. gravis. 



60. M. fuliginea. 



61. M. compressipes. 



62. M. inocyb'iformis, 



4. M. melaleuca. 



63, M. subargillacea, 



64. M. phaeopodia. 



65. M. Volkertii. 



66. M. piper ata. 



67. M. semivestita, 



68. M. praecox. 



69. M. subfuliginea. 



70. M. Totienii. 



71. M, resplendens. 



72. M. subresplendens. 



73. M. angusti folia. 



74. M. intermedia. 



75. M. terrifera. 



76. M. Russula. 



77. M. subtransmutans. 



78. M. viscosa. 



79. M. transmutans. 



80. M. portentosa. 



81. M. auxantia 



82. M. equestris. 



83. M. rkinaria. 



84. M. subterrea. 



85. M. centralis. 



86. M. subsejuncta. 



87. M. sejuncta. 



4, M. melaleuca. 



88. M. tenuipes. 



