60 THE CHICAGO ACADEMY OF SCIENCES 



Russula atropurpurea Pk. 



Pileus at first convex then, centrally depressed, glabrous, 

 dark-purple, blackish in the center, the margin even or slightly 

 striate; flesh white, grayish or grayish-pink under the separable 

 pellicle; taste mild; odor of the drying plant foetid, very un- 

 pleasant. 



Lamellae nearly equal, subdistant, sometimes forked near the 

 stem, at first white, then yellowish, becoming brownish where 

 bruised. 



Stem equal, glabrous, spongy within, white, brownistTwhere 

 bruised. 



Spores subglobose, minutely rough, pale-ochraceous with a 

 salmon tint, 7.5 to 10 /*. Pileus 7.5 to 10 cm. broad; stem 5 to 

 7.5 cm. long, 10 to 16 mm. thick. 



Grassy places in woods, Glen Ellyn. June. Pileus up to 10 

 cm. in diameter; spores globose, rough, 9 to 10 p. The odor of the 

 plant will not be forgotten by one who has attempted to dry 

 specimens. 



Russula emetica Fr. 



Pileus at first rosy then blood-color, tawny when old, at first 

 campanulate then flattened or depressed, polished, -margin at 

 length sulcate and tubercular; flesh white, reddish under the 

 separable pellicle; taste very acrid. 



Lamellae somewhat free, broad, somewhat distant, shining- 

 white. 



Stem stout, spongy-stuffed, elastic when young, fragile when 

 older, even, white or reddish. 



Spores white, sphaeroid, echinulate, 8 to 10 /x. Pileus 5 to 10 

 cm. broad; stem 5 to 10 cm. high, 1 to 2 cm. thick. 



Woods. Frequent. Very fragile when old. Most authors 

 consider it poisonous; Mcllvane states that it is edible. 



Russula pectinata Fr. 



Pileus at first viscous, toast-brown, then dry, becoming pale, 

 tan, with the disk always darker, fleshy, rigid, convex then 

 flattened and depressed or concave-infundibuliform; margin 

 thin, pectinate-sulcate, here and there irregularly shaped; flesh 

 white, light-yellowish under the pellicle which is not easily 

 separable. 



Lamellae attenuate-free behind, broader toward the margin, 

 somewhat crowded, equal, simple, white. 



Stem rigid, spongy-stuffed, longitudinally slightly striate, 

 shining white, often attenuated at the base. Odor weak but 

 nauseous. 



Spores globose, 8 to 9 ft.; pileus 7.5 cm. broad; stem 7.5 cm. 

 long, 2 to 2.5 cm. thick. 



Woods, Glencoe and Glen Ellyn. August. The plant when 

 young is smooth, watery-brown, viscid, and has the margin of the 

 pileus strongly incurved. The flesh is not always yellowish under 



