138 THE AGARICACEAE OF MICHIGAN 



long striations aud the medium size are the-best recognition marks 

 iu the field. It differs, of course, from R. foetens by lack of a strong 

 odor. Whether the margin is at first incurved is nowhere noted. 



113. Russula sororia Fr. 



Epicrisis, 1S3G-3S (as subspecies of R. consobrina). 

 Illustration: Cooke, 111., PL 1057. 



PILEUS 3-6 cm. broad, rather firm, convex then subexpanded, 

 viscid when moist, margin substiiate when mature, pellicle some- 

 what separable along margin, gray, olivaceous-brown or grayish- 

 brown. FLESH white, unchanged. OILLS narrow, subdistant, dis- 

 tinct, white for a time, then discolored, adnate, shorter ones inter- 

 mingled, rarely forked, interspaces venose. STEM 2.5-5 cm. long, 

 1-2 cm. thick, white, not becoming cinereous, short, spongy-stuffed. 

 SPORES v?Mte. TASTE acrid, ODOR none. 



Solitary. Woods in southern Michigan. August and September. 

 Rare. This species used to be placed under R. consobrina. 



114. Russula vesca Fr.-Bres. 



Epicrisis, 1836-38. 



Illustrations: Cooke, 111., PL 1075. 



Bresadola, Fungh. mang. e. vel., PL 72. 



Ibid, Fung. Trid., PL 128 (as R. lilacea var. carnicolor). 



Michael, Fiihrer f. Pilzfreunde, Vol. I, No. 41 b. 



PILEUS 3-6 cm. broad, fleshy, firm, convex then expanded and de- 

 pressed in the center, viscid, soon dry, more or less rugulose or 

 wrinkled, reddish, pale livid-pink, or sordid flesh-red, becoming- 

 paler, cuticle thin and disappearing, not quite reaching the edge of 

 the pileus so that a narrow white exposed margin results, margin 

 even and spreading. FLESH white. GILLS white, thin, at length 

 stained lurid-brownish or rusty, close, moderately narrow, adnate, 

 forked or anastomosing at base. STEM white, obscurely rivulose, 

 hard and compact, subequal, solid, 3.5-4.5 cm. long, 1.5 cm. thick, 

 often discolored by yellowish-rusty stains. SPORES white in mass, 

 subglobose, minutely echinulate, 7-8 micr. TASTE mild. ODOR 

 none. Rare. 



Only a few doubtful collections have been made in southern 



