98 AGARICINI. 



R. heterophylla. Fr. Unequal-gilled Russula. 



Pileus, variable in color, but never reddish or purple, 

 fleshy, firm, convex plane, with a thin pellicle, which disap- 

 pears, margin thin, even, or slightly striated. 



Gills, reaching the stem in an attenuated form, very narrow, 

 crowded, forked and dimidiate, white. 



Stem, firm, solid, even, shining white. 



Taste mild. In woods, especially on clayey slopes. Lehigh Valley. 

 Edible ; mild to the taste. 



R. cyanoxanthus. SchafT. Bluish Yellow Russula. 



Pileus, lilac or purplish, then greenish, disk yellowish, 

 margin blue or purple, convex, then plane, depressed in center, 

 pellicle viscid, margin deflexed, remotely striated, flesh firm. 



Gills, rounded behind, connected by veins, forked, white. 



Stem, solid, spongy, stuffed, often cavernous, equal, white. 



Mild. Common in woods near Cedar Fountain Creek. 



R. foetens. 



Pileus, dirty white or yellowish, flesh thin, bullate, ball- 

 like, then expanded, covered with a pellicle which is adnate, 

 viscid in wet weather, margin with ribs, which are at length 

 tuberculate. 



Gills, adnexed, connected by veins, with many dimidiate, 

 whitish. 



Stem, stout, stuffed, then hollow, concolor. 



Acrid, poisonous. Odor fetid, sickening. Not very common in the 

 Valley. Common in chaparral woods. 



Var. rubescentipes. Pk. 



This is a beautiful variety found in an open woods under 

 oak trees. It is of a beautiful red tint, especially the stem. 

 Prof. Peck determined it and named it as above. 



