144 THE AGARICACEAE OF MICHIGAN 



120. Russula aerugiaea Liadb. (iion Fr.) (Edible) 



Svanipbok, 1902. 



IllustratioDs: Ibid, Fig. 52. 



Cooke, 111., ri. 1044 (as R. heterophylla Fr.). (Doubtful.) 

 Michael, Fiihrer f. Pilzfreunde, Vol. II (as R. livida Pers.). 

 Ricken, Blatterpilze, PI. 16, Fig. 2 (as R. graminicolor Quel.). 



PILEUS 5-8 cm. broad, moderately firm, then fragile, convex to 

 expanded, subdepressed, dull greenish, dark green to smoky-green, 

 paler on margin, pellicle adnate, subviscid when moist, soon dry with 

 a dull luster and siidpulverulent to pruinose-velvety , slightly separ- 

 able on margin, even or substriate in age. FLESH thick on disk, 

 thin on margin, white, sometimes cinereous to greenish under pel- 

 licle. GILLS narrowly adnate or almost free, close to subdistant, 

 rather narroio, slightly broader in front, entire or verv few short 

 ones, distinct, white at first tlien pale creamy-iohite, becoming dingy 

 in age, bifurcate at base, intervenose. STEM 4-5 cm. long, 1 cm. 

 thick, subequal or tapering downward, glabrous, white, spongy- 

 stuffed, firm, even. SPORES subglobose, creamy-iohite, 6-9 micr. 

 TASTE mild. ODOR none. 



Gregarious or solitary. On the ground in coniferous or mixed 

 woods of the Northern Peninsula. Marquette, Sault Ste. Marie. 

 July- September. Infrequent. 



This species is considered identical with R. graminicolor Quel, 

 by the French mycologists. The "shining-white gills" (candidae) 

 of the Friesian description is probably an error, R. heterophylla 

 Fr. is now limited by most writers to a plant with pure white gills 

 and spores and is rare. R. oUvascens Fr., reported (Mich. Acad. Sci. 

 Rep. 11, p. 76, 1909), has been omitted as it appears too close to this 

 species; the specimens referred to it had a more yellowish tint to 

 the spore-mass. 



121. Russula xerampelina Fr. (Suspected) 



Epicrisis, 1836-38. 



Illustrations: Cooke, 111., 1041 (as R. oliimcea). 



Gillet, Champignons de France, No. 628 (as R. olivacea). 

 Ricken, Pdatterpilze, PI. 18, Fig. 4 (as R. olivacea). 



PILEUS 5-10 cm. broad, firm, convex then piano-depressed, dry 

 or very slightly viscid in wet weather, ])ellicle hardly separable, 



