72 THE CHICAGO ACADEMY OF SCIENCES 



PLUTEUS. 



Without a volva or ring; hymenophore distinct from the stem; 

 lamellae rounded behind and free, cohering at the first, white, 

 then flesh-colored, occasionally tinged with yellow. Growing on 

 or near trunks. Spores rosy. 



Pileus with a smooth pellicle P. cervinus. 



Pileus granulose or fibrillose 1 



1. Stem concolorous with the pileus P. granularis. 



1. Stem white P. nanus. 



Pluteus cervinus Schaeff. 



Pileus fleshy, somewhat fragile, campanulate then expanded, 

 obtuse, when young covered over with a continuous pellicle which 

 is viscid in wet weather, becoming even, smooth, fuliginous, but 

 gradually broken up into fibrils or squamules, margin entire and 

 naked; flesh soft, white. 



Lamellae rounded behind, wholly free, crowded, ventricose, 

 somewhat crenulated, white then flesh-color. 



Stem solid, firm, equal, white but externally reticulated or 

 striate with black fibrils. 



On stumps and fallen trunks. Frequent. May to November. 

 Pileus 5 to 7.5 cm. broad; stem 7.5 to 10 cm. long, 8 to 12 mm. 

 thick. Spores in our plants subsphaeroid, slightly irregular, 

 5 to 6 /A. 



Pluteus granularis Pk. 



Pileus convex or nearly plane, subumbonate, granulose or 

 granulose-villose, varying in color from yellow to brown. 



Lamellae rather broad, crowded, ventricose, whitish then 

 flesh-colored. 



Stem equal, solid, colored like the pileus, often paler at the 

 top, velvety-pubescent, rarely squamulose. 



Pileus 3.5 to 5 cm. broad; stem 3.5 to 7.5 cm. long, 2 to 4 mm. 

 thick. Spores subglobose or broadly elliptical, 6 to 7.5 x 5 to 6 /w,. 

 Decaying wood and prostrate trunks in woods, June to September. 



On dead wood. Bowmanville. July. Collected and identi- 

 fied by Wyrick. 



Pluteus nanus Pers. 



Pileus convex, rather thin, fibrillose or somewhat mealy, 

 brown. 



Lamellae rather broad, a little narrower outwardly, white, 

 becoming pale flesh-color, free. 



Stem white, firm, striate, solid. 



Pileus about 2.5 cm. broad; stem 2.5 to 5 cm. long. 



On decaying stumps in woods. Glen Ellyn and River Forest. 

 June and July. Spores globose, about 5 p. 



