6 



NORTH AMERICAN FLORA 



[Volume 10 



Pileus and stipe considerably larger. 



Lamellae very broad; spores 8.5 X6 ft. 



Lamellae of medium breadth; spores 5-6 X3-4 p. 



Pileus 6-8 cm. broad. 



Surface entirely white. 



Surface whitish with a caesious tint, black on the disk. 



Pileus 10-14 cm. broad. 



Sporophores gregarious; lamellae becoming cinereous on 



drying; spores ellipsoid. 



Sporophores densely cespitose; lamellae not changing as 



above; spores globose. 



Surface of pileus light-buff, 10-14 cm. broad; spores ellipsoid, 

 5-7 X2.5-4.5 p.. 



Surface of pileus rose-tinted, the ground-color being isabelline, 

 4 avellaneous, or pale-brown. 

 Lamellae white, unchanging. 



Pileus avellaneous with a rosy tint; lamellae broad, very 



white in dried specimens. 

 Pileus brownish-pink, with browner circular spots; lamellae 

 narrow, yellowish-discolored in dried specimens. 

 Lamellae pale-rosy-isabelline, becoming slightly purplish- 

 spotted when bruised or on drying; sporophore having the 

 odor of walnuts in dried specimens. 

 Surface of pileus latericeous; stipe rose-colored. 

 Surface of pileus some shade of yellowish-brown. 



Pileus fulvous at the center, pale-fulvous near the margin; spores 



globose, about 3.5 fi. 

 Pileus umbrinous, margin concolorous; spores ellipsoid, 7-8 

 X4/x. 

 Surface of pileus some shade of gray or avellaneous. 

 Pileus 4-8 cm. broad. 



Surface minutely striate except at the center. 

 Surface not at all striate. 

 Stipe long, slender, equal. 

 Stipe shorter and thicker, about 7 X2 cm. 

 Stipe much enlarged below. 

 Stipe subequal, not enlarged below. 

 Pileus larger, usually 8-15 cm. broad. 



Pileus with a prominent umbo, stipe enlarged at the base; 



sporophores scattered. 

 Pileus without an umbo; stipe cylindrie; sporophores grow- 

 ing in conspicuous circles. 

 Surface of pileus viscid or rarely decorated with fibrils or scales. 

 Pileus white. 

 Pileus sulfur-yellow. 



Pileus white stained with rusty-brown; growing in good soil. 

 Pileus ferruginous ; growing in pure sand. 

 Pileus pale-yellow tinged with red; lamellae yellow. 

 Pileus some shade of dark -red. 

 Lamellae and stipe white. 

 Lamellae and stipe pale-rosy-isabelline. 

 Pileus fuliginous or purplish-gray. 

 Surface smooth; odor none. 

 Surface radiate-lineate; odor strong. 



89. M. platyphytta, 



90. M. pinicola. 



91. M.farinacea. 



92. M. sublurida. 



93. M. Olesonii. 



94. M. submulticeps. 



95. M. rudericola. 



96. M, bicolor. 



97. M. roseibrunnea 



98. M. nuciolens. 



99. M. subvelata. 



100. M. collybiiformis, 



101. M. Bar peru 



102. M. striatella. 



103. M. subcinereiformis, 



104. M, avellanea. 



105. M.fumosella. 



106. M. porlolensis 



107. M, oreades. 



108, 

 109, 

 110, 

 111. 

 82. 



112. 

 113. 



114. 

 80. 



M. secedifolia. 

 M. Yatesii. 

 M. dryophila. 

 M. arenicola. 

 M. equestris. 



M. subannulata. 

 M. subpessundata 



M. avellaneifolia. 

 M. portentosa. 



III. Species occurring in tropical North America 



Lamellae white, pale-yellow, or dirty-brownish. 



Pileus dingy-isabelline. 



Pileus purplish-lilac; stipe concolorous. 



Pileus castaneous; stipe white. 

 Lamellae reddish; pileus latericious. 



Spores globose, 3-4 ix. 



Spores ovoid, 9-12 X4-7 p: 



115. M. subisabellina. 



116. M. dichropus. 



117. M.jalapensis. 



118. M. jamaicensis. 



119. M. holoporphyra. 



1. Melanoleuca alboflavida (Peck) Murrill. 



Agaricus alboflavidus Peck, Ann. Rep. N. Y. State Cab. 23: 75. 1&72. 



Pileus fleshy, convex, becoming plane or slightly depressed, sometimes gibbous, 5-7.5 cm. 

 broad; surface glabrous, smooth, moist in wet weather, white, sometimes tinged with yellow, 

 margin at first involute; context white; lamellae narrow, crowded, thin, emarginate, white; 

 spores ellipsoid, 7.5-8.7X4-5 m; stipe very slender, equal, solid, fibrillose-striate, somewhat 

 bulbous, whitish, 7.5-10 cm. long, 6-8 mm. thick. 



Type locality: Sandlake, New York. 



Habitat: Fields and thin woods. 



Distribution: New England and New York to the mountains of Virginia. 



