94 



Mycologia 



Type Locality: Stow, Massachusetts. 



Habitat : On damp ground under chestnut trees, solitary or 

 gregarious, August 7 to September 22. 



Relationship and Characteristics : This species seems to 

 be related to the Betulinae group. The lamellae do not discolor 

 at all and the discoloring of the stipe is so slight that it might 

 easily he overlooked, so that it does not seem to be related to the 

 Decolorantes. It can easily be distinguished by the general yellow 

 color of the pileus and the reddish stem. The flesh is nearly as 

 compact as in some species of the Compactae. The pruinose- 

 pilose lamellae forking at the inner end, and the unequal stipe 

 with its slight discoloration are some of the characteristics which 

 prevent its being considered a yellow form of Russula alutacea Fr. 



Russula disparalis sp. nov. 



Pileus broadly convex, becoming expanded and depressed in 

 the center, up to 5.5 cm. broad ; surface buff-yellow near the 

 margin, Apricot-yellow toward the center, Sandford's brown to 

 Auburn or Hessian-brown on the disk, viscid when wet, with 

 separable pellicle, pruinose, otherwise glabrous ; margin striate 

 and obsoletely tuberculate, inrolled until mature ; context white, 

 taste su'bacrid, odor not distinctive ; lamellae white, mostly equal 

 but a few not long enough to reach to the stipe, adnexed and 

 rounded next the stipe, rather broad, subcrowded; stipe white, 

 equal, spongy, becoming hollow, glabrous, rugose, subflexuose to 

 straight, up to 5.5 cm. long and 1.5 cm. in diameter; spores 

 ochroleucous, broadly ellipsoid, uniguttulate, apiculate, minutely 

 echinulate, 8.7-10 X 6—7.5 from 1.5 to 1.8 jx being taken up by 

 the point at the apex of the spore. 



Type Locality: Stow, Massachusetts. 



Habitat : Under chestnut trees in damp ground near a swamp. 

 Also under Pteris aquilina, Osmunda cinnamomea, Osmunda 

 regalis, black and white birch, and alder. Found from August 

 4 to September 11. 



Relationship and Characteristics : This species belongs to 

 the group Palustres. It may be recognized by the contrasting 

 yellow margin and the dark-brown center, and the pure-white 

 stipe. It is so different in appearance from other Species of 



