252 NORTH AMERICAN FLORA 
Stipe pruinose to glabrous, 2.5 cm. long. 
Stipe glabrous and shining from the first, 3-6 cm. long. 
Lamellae about 12-16 in number. 
Lamellae about 8 in number. 
Surface of pileus some shade of purple or violet. 
Surface pale-purple, fading to whitish on drying; lamellae decurrent; 
pileus infundibuliform. : . 
Surface purple or violet, not fading to whitish on drying. 
Pileus about 2 cm. broad. 
Lamellae pallid. 
Lamellae blackish-purple. 
Pileus 2~6 cm. broad. 
Surface of pileus brown or somewhat blackish. 
Surface pale-fuscous; lamellae adnexed; pileus convex. 
Surface brown, rarely tinged with violet. 
Stipe less than 1 em. long. 
Stipe 2 cm. or more Jong. 
Pileus becoming distinctly depressed; lamellae not crowded. 
Lamellae decurrent. 
Lamellae adnate. 
Pileus convex to plane; lamellae crowded. 
II. 
Pileus fleshy or subfleshy, 1 cm. or more broad; stipe more or less 
tomentose or hairy, at least below; lamellae free or adnexed. 
Pileus white. 
Pileus not white, sometimes pallid in dried plants. 
Plants large, the pileus 2 cm. or more broad. 
Lamellae crowded. 
Plants with odor and taste strong of onions. 
Spores small. 
Spores 12-144 long. 
Plants without odor or taste of onions. 
Stipe smooth above. , 
Pileus umbonate; western plants. 
Pileus not umbonate; eastern plants. 
Stipe more or less tomentose throughout. 
Lamellae free, remote; stipe enlarged at the apex. 
Lamellae adnexed; stipe not enlarged at the apex. 
Stipe long and twisted; pileus usually pallescent. 
Stipe not long and twisted; pileus brown. 
Lamellae not crowded. 
Taste strong and acrid; lamellae usually becoming: reddish. 
Pileus purple. 
Pileus not purple. 
Lamellae broad. 
Lamellae narrow. 
Stipe long. 
Stipe short. 
Taste not strong and acrid. 
Plants dark-purplish-brown. 
Plants not dark-purplish-brown. 
Lamellae free, usually growing in lawns or grassy 
places. 
Lamellae adnexed, growing in woods. 
Stipe spongy, thickened at the base. 
Stipe short, neither spongy nor thick at the base. 
Lamellae not dark in dry plants. 
Lamellae becoming brown or reddish. 
Plants smaller, the pileus rarely 2 cm. broad. 
Stipe white or entirely covered with a white tomentum. 
ae small, 8-10 mm. broad; lamellae attached to a free 
collar. 
Pileus larger, 10-20 em. broad; lamellae adnexed. 
Stipe neither entirely white nor covered with a white tomentum. 
Pileus umbonate. 
Plants densely cespitose. 
Plants not densely cespitose. 
Lamellae broad behind. 
Lamellae narrow. 
Pileus not umbonate. 
Odor or taste strong or disagreeable. 
Lamellae annulate-adnexed; pileus umbilicate and 
striate. 
Lamellae not annulate-adnexed; pileus not um- 
bilicate. 
Lamellae few, distant; odor mephitic. 
Lamellae subcrowded; odor of onions. 
73. M. 
79. 
80. 
81. 
SPECIES OCCURRING IN TEMPERATE NorTH AMERICA 
123. 
82. 
83. 
87. 
88. 
84. 
85. 
86. 
89. 
90. 
91. 
92. 
96. 
93. 
94. 
95. 
92. 
131, 
97. 
87. 
98. 
99. 
100. 
101. 
83. 
BE 5 8 
SS 8 §§ 8 
XS 88 8 5 
SS 8 8S 
[ VOLUME 9 
. badius. 
. haematocephalus. 
. tageticolor. 
. purpurascens. 
. Sevicipes. 
glaucopus. 
. tonides. 
. coracipes. 
. curtipes. 
. cyathiformis. 
. subcyathiformis. 
. Johnstonii. 
phyllophilus. 
polyphyllus. 
prasiosmus. 
washingtonensis. 
fasciatus, 
confluens. 
archiropus. 
multifolius. 
tocephalus. 
peronatus. 
subnudus. 
rubrophyllus. 
fuscopurpureus. 
caryophylleus. 
Spongiosus. 
dichrous. 
rubrophyllus. 
Olneii. 
Sutliffae. 
washingtonensis. 
trullisatipes. 
umbonatus. 
foetidus, 
Copelandi. 
prasiosmus. 
