66 ELEVENTH REPORT. 



Gregarious or solitary. Common in conifer and mixed woods of northern 

 Michigan, in oak and maple, etc., of southern Michigan; thruout the state. 

 July to September. 



Our Michigan plants quite often show the marked distant gills character- 

 istic of the Swedish plant, altho plants occur Avhich have only subdistant 

 gills. The flesh, gills, etc. of fresh young plants first turn pinkish-red when 

 bruised then black, but the red stain is often absent in old plants as would 

 be expected by the drying up of the scanty red juice which is supposed to 

 cause this phenomenon. 



4. RUSSULA SORDIDA Pk. 



(The sordid Russula.) ' 



Illustrations: N. Y. State Mus. Bull. 105, 1905. P. 29, PL 98, Fig. 1-3. 



PiLEUS 5-12 cm. broad, fleshy, dry, convex-depressed, margin incurved 

 or inroUed, glabrous, chngy-white becoming smoky with age. Flesh whitish 

 becoming blackish-brown or bluish-black where bruised. Gills white 

 becoming blackish in age, close, alternately long and short, adnate or slightly 

 decurrent, few forked, rather narrow. Stem short, 3-5 cm. long, 1-2 cm. 

 thick, firm, solid, equal, whitish becoming black where handled. Spores 

 globose, 7-8 micr., white in mass. Taste mild or tardily slightly acrid. 

 Odor none. 



Solitary. Hemlock woods. July. Infrequent. 



The cap, gills, etc. all turn blackish or bluish-black when bruised without 

 first turning reddish. The latter peculiarity distinguishes it from both R. 

 nigricans and R. densifolia. From the former it also differs in the dry pileus 

 and close gills. From R. adusta it differs by the rapid change to black on 

 wounding. 



5. RUSSUEA SUBSORDIDA Pk. 



Illustrations: N. Y. State Mus. Bull, 105. P. 40, PL 99, Fig. 1-5. 



This species is said by its author to differ from the preceding, in its viscid 

 pileus, dingy gills, and changing to blackish more slowly. Not 3^et reported. 



6. Russula adusta (Pers.) Fr. 

 (The scorched Russula.) 



Illustrations: Hard's Mushrooms. 1908. P. 183, Fig. 145. Atkinson's 

 Mushrooms. 1901. P. 126, Fig. 6. 



Pileus 5-8 cm. broad, fleshy, compact, convex then depressed to sul:)in- 

 fundibuliform, whitish then brownish or sooty-gray, glabrous, dry, even. 

 Flesh white, not changing when bruised. Gills white, becoming sordid, 

 close, thin, short and long alternating, adnate to subdecurrent, narrow. 

 Stem stout, equal or subequal solid, white then sooty-gray, 3-5 cm. long, 

 about 1.5 cm. thick, glabrous, even. Spores, siibglobose, slightly echinulate, 

 6-9 micr., white in mass. Taste viild. Odor none. 



Solitary. In mixed woods of northern Michigan, probably thruout the 

 state. July-September. 



"On drying the plants do not turn black as do R. nigricans, R. sordida 

 and R. suhsordida. The one most closely allied to it is R. densifolia Seer., 

 which has truly crowded gills and, like R. nigricans, first turns red when 

 bruised. 



