154 THE AGARICACEAE OF MICHIGAN 



132. Russula fallax Cke. 

 Illustration : Cooke, 111., PL 1059. 



PILEFS 3-7 cm. broad, thin, fragile, color incarnate or pale rose, 

 the dish pale olivaceous or livid, sometimes darker or purplish, soon 

 plane or slightly depressed on disk, quite viscid, margin striate and 

 becoming elevated, surface faintly rugnlose under lens. FLESH 

 white. GILLS white, unchanged, subdistant, attached by a point, 

 narrow, edge even. STEM 3-4 cm. long, G-10 cm. thick, pure white, 

 cylindrical or compressed, equal, spongy-stuffed, soon hollow, longi- 

 tudinallv-wrinkled under a lens. SPORES white in mass, sub- 

 globose, 7.5 niicr. TASTE promptly and very acrid. 



Solitary or gregarious. In sphagnum bogs, low mossy ground in 

 woods, etc., often attached to sphagnum. Distributed throughout 

 the state. Not rare. July, August and September. 



This species differs in two important particulars from R. fragilis. 

 The gills are subdistant and the pileus is livid or olivaceous in the 

 center. It is very characteristic of the sphagnum flora of the state. 

 It has often been referred to 7?. fragiUs as a variety. The pileus is 

 not as lilac as shown in Cooke's figure. 



133. Russula albidula Pk. 

 Torr. Bot. Club, Bull. 25, 1898. 



PILEUS 2.5-5 cm. broad, white, broadly convex, glabrous, the pel- 

 licle viscid and separable when fresh, the margin even. FLESH 

 white, subfragile. GILLS white, rather crowded, adnexed, not 

 broad, of equal length, some basifurcate, interspaces venose. STEM 

 2.5-4 cm. long, 8-12 mm. thick, white, equal, spongy-stuffed, even. 

 SPORES white in mass, subglobose, 7-10 micr. TASTE acrid. 

 ODOR none. 



Solitary. In oak woods. Ann Arbor. July and August. 



In dried specimens the pileus and gills are ochraceous to yellow- 

 ish, and stem whitish. The taste and viscidity seem to be the only 

 marked differences between this species and the other two white 

 Russulas of Peck, 7?. albida and R. albella. All three are rather 

 fragile, while R. lactea is a compact firm plant with thick, broad, 

 distant gills. There is a white variety of R. emetica which is very 

 acrid and fragile and whose striations on the margin of the cap 

 are like those of that species. 



