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 

 brui- 



Stem equal, glabrous, spongy within, white, brownish ^where 

 bruised. 



ires subglobose, minutely rough, pale-ochraceous with a 

 salmon tint, 7.5 to 10 /*. Pileus 7.5 to 10 cm. broad: stemJ5 

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



Grassy places in woods, (den Ellyn. -June. Pileus up to L0 

 cm. in diameter; spi ibose, rough, 9 to 10 /a. The odor of the 



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



cimens. 



Russula emetica Fr. 



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

 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, somewhal distant, shining 

 white. 



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

 older, even, white or reddish. 



Spores white, sphaeroid, echinulate, 8 to 10 fi. Pileus 5 to 10 

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



AVoods. Frequent. Very fragile when old. Mos1 authors 

 consider it poisonous: Mcllvane - hat 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. 



^tem rigid, spongy-stuffed, longitudinally slightly striate, 

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

 nauseous. 



Spores globose, 8 to 9 /*.; pileus 7.5 cm. broad; -tern 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 



