94 AGARICINI. 



Fragiles, texture soft and brittle, margin striated, with a 

 viscid pellicle. 



R. nigricans. Bull. Dark Russula. 



Pileus, two to four inches broad, dark fuscous, at length 

 nearly black, fleshy, flesh turning red when cut or bruised, 

 convex, flattened, umbilicato, depressed, margin entire. 



Gills, rounded behind, slightly adnexed, thick, distant, 

 reddening when touched. 



Stem, solid, equal, pallid when young, at length black. 



Taste disagreeable, not edible. Easily identified by the black color. 

 Common in August and September throughout the Valley. Very 

 abundant in Dorney's woods near Allentown, Pa. 



R. adustus. Pers. Smoky Russula. 



Pileus, fuliginous, cinereous, flesh compact, margin even 

 and inflexed ; center depressed. 



Gills, adnate, decurrent, thin, crowded, unequal, white, not 

 reddening when bruised. 



Stem, solid, obese, of the same color as the pileus. 



In appearance it is similar to R. nigricans, but differs from 

 it in not having the red color on being bruised. 



Common in Dorney's woods near Allentown. 



R. delica. Fr. Weaned Russula. 



Pileus, three to four inches or more broad, fleshy through- 

 out, firm, umbilicate, regular, margin entire, smooth, white, 

 flesh firm, juiceless. 



Gills, decurrent, distant, unequal, white, exuding drops of 

 water in wet weather. 



Stem, solid, thick, short, white. 



In appearance it is like unto Lactarius vellereus. 



Common in open woods all through the Valley. July and August. 



