CLASSIFICATION OP AGARICS ' 161 



143. Russula sericeo-nitens Kauff. (Edible) 

 Mich. Acad. Sci. Eep. 11, p. 84, 1909. 



PILEUS 4-6 cm. broad, very regular, rather thin, convex then 

 piano-depressed, dark violet-purple or dark blood-red tinted pur- 

 plish, disk sometimes livid-blackish, the separate pellicle slightly 

 viscid when moist, not striate or substriate in age, surface with a 

 silky sheen. FLESH white, thin on margin, unchanged, purplish 

 under the pellicle. GILLS white, subdistant or medium close, be- 

 coming flaccid, moderately broad, broad in front, narrowed behind, 

 dry, equal, few forked near base, interspaces venose. STEM white, 

 equal or thickened at apex, spongy within, unchanged, glabrous, 

 even or obscurely rivulose, 3-5.5 cm. long, 1 cm. thick. SPORES 

 white in mass, globose, echinulate, G-7.5 micr. TASTE mild. ODOR 

 none. 



Usually solitary. In mixed woods of hemlock, maple and yellow 

 birch in northern Michigan. July and August. Not uncommon. 



Its thin pileus is flexihle at maturity. The silky sheen and regu- 

 lar pileus are quitfe characteristic. The cap has the color of Cooke's 

 figures of R. queletii Fr., R. drimeia Cke. and R. purpurea Gill. 

 These three, including R. expallens Gill., have been placed together 

 by some modern authors as one species, characterized by "a 

 pruinose, violaceous, decolorate stem, and very sharp taste." The 

 taste is said to be so pepperj'- that even when the color is washed 

 out by rains they can be recognized by this character. All of the 

 four are violet or reddish on the stem. Our specimens all had a 

 white stem and an impeachable mild taste. 



Section IV. Taste mild; spore-mass cream-white, yellowish or 

 ochraceous. 



144. Russula Integra Fr. (Edible) 



Epicrisis, 1836-38. 



Illustrations: Cooke, 111., PL 1093 and 1094. 



PILEUS 5-10 cm. broad, firm, soon fragile, discoid, convex or 

 campanulate then piano-depressed covered with a viscid separable 

 pellicle, thin on the margin, at length coarsely tudercular-striate, 

 variable as to color in different plants, colors dingy or sordid, from 

 buff through to reddish -brown and dark dull red, fading.' FLESH 

 white, not changing. GILLS white at first, then creamy-yellow 



