74 NEW YORK STATE MUSEUM 



Pusilla 



Pileus small, less than 3.5 cm broad. 



Several species have been referred to this section that have not 

 a viscid pileus, but in some it is moist. 



KEY TO THE SPECIES 



Pileus slightly viscid when moist 1 



Pileus not viscid when moist 4 



1 Pileus white or yellowish white. sociale 



1 Pileus some other color 2 



2 Pileus ochraceous yellow gregarium 



2 Pileus tawny brown or reddish brown 3 



3 Stem 2.5 cm long, center of pileus not changing color sordidulnm 



3 Stem longer, center of pileus changing color with age 



or in drying discomorbidum 



4 Pileus hygrophanous when moist 5 



4 Pileus not hygrophanous when moist 7 



5 Stem white palustre 



5 Stem not white ' .6 



6 Pileus uniformly brown illicitum 



6 Pileus brown with a whitish or pallid margin pallidomarginatum 



7 Pileus broadly umbonate, stem solid excedens 



7 Pileus not umbonate, stem hollow f ragilius 



Hebeloma sociale Pk. 



SOCIAL PIEBELOMA 

 N. Y. State Mus. Bui. 75, p. 15 



Pileus fleshy but thin, convex becoming plane or nearly so, gla- 

 brous, slightly viscid when moist, yellowish white, flesh yellowish 

 white, taste nauseous ; lamellae thin, close, adnexed, whitish, then 

 yellowish, finally brownish ferruginous ; stem short, fibrous, floc- 

 cose fibrillose, hollow, white; spores brownish ferruginous, ellip- 

 soid, 6-8 x 4-5 ft. 



Pileus 2-3 cm broad ; stem 2.5-3.5 cm l° n g> 3~6 mm thick. 



Gregarious or subcespitose.' Among short grass in pastures. 

 Albany co. October. 



This is distinguished from our other white or whitish species, 

 by its peculiar habitat and its small spores. 



