74 THE CHICAGO ACADEMY OF SCIENCES 



Lamellae broad, subdistant, slightly adnexed, becoming free 

 or nearly so, often wavy or uneven on the edge, whitish, becoming 

 flesh-colored at maturity. 



Stem equal or nearly so, solid, somewhat fibrous externally, 

 mealy at the top, white. 



Pileus 10 to 15 cm. broad; stem 10 to 15 cm. long, 16 to 24 

 mm. thick; spores angular, 8 to 10 /A. 



Specimens agreeing with the description, except in size, were 

 found by Mr. Gammon, growing on the ground in woods at Glen 

 Ellyn, September, 1900. In these plants the pileus was only 

 9 cm. broad, the stems 11.5 cm. long, about 18 mm. thick; sppres 

 angular, about 9 p. 



Entoloma nigricans Pk. 



Pileus thin, convex, becoming irregularly expanded and cen- 

 trally depressed, innately silky-fibrillose, shining, dark-gray or 

 blackish, the cuticle often radiately cracking, inodorous. 



Lamellae broad, subdistant, sinuate, adnate, salmon color. 



Stem equal, silky-fibrillose, solid then hollow, shining, white 

 streaked with black, sometimes scurfy at the top. 



Spores salmon-color, angular, uninucleate, 8 to. 12 /x. long, 

 nearly as broad. Pileus 2.5 to 4 cm. broad; stem 2.5 to 5 cm. 

 long, 4 to 8 mm. thick. 



In low woods, River Forest, August, 1905. Easily overlooked 

 as the surface of the pileus is colored so nearly like the dead 

 leaves and naked earth on which the plant grows. Lamellae at 

 first whitish, irregularly attached, sometimes deeply sinuate and 

 adnate, sometimes scarcely sinuate but somewhat decurrent. 

 Spores about 10 /*. in diameter. 



CLITOPILUS. 



Stem fleshy or fibrous, diffused upward into the pileus, the 

 margin of which is at first involute; hymenophore continuous 

 with the stem; lamellae equally attenuated and somewhat de- 

 current, not separating -or sinuate. Growing on the ground. 

 Spores rosy. 



Pileus silky-tomentose C. abortivus. 



Pileus finely pruinose C. prunulus. 



Pileus glabrous C. caespitosus. 



Clitopilus abortivus B. & C. 



Pileus fleshy, fifm, convex or nearly plane, regular or ir- 

 regular, dry, clothed with a minute silky tomentum, becoming 

 smooth with age, gray or grayish-brown; flesh white, taste and 

 odor subfarinaceous. 



Lamellae thin, close, slightly or deeply decurrent, at first 

 whitish or pale gray, then flesh-colored. 



Stem nearly equal, solid, minutely flocculose, sometimes 

 fibrous-striate, colored like or paler than the pileus. 



Spores irregular, 7.5 to 10 x 6 /x. 



