Parv 4, 1915] AGARICACEAE 235 
112. Russula nigrodisca Peck; J. M. Macoun, in D. S. Jordan, 
Fur Seals N. Pacif. 3: 583. 1899. 
Pileus convex or nearly plane, 2.5 to 4 cm. broad; surface dull-dark-red near the margin, 
nearly black on the disk, viscid when young and moist, glabrous, margin even: context similar 
to that of Russula subfragilis, taste not recorded in the type description: lamellae whitish, 
entire, subdistant, narrowed toward the stipe, thin; stipe white, nearly equal, 2.5 to 4 em. 
long, 4 to 8 mm. thick: spores white, subglobose, finely echinulate, 7.5 & 9.5-11.5 u. 
TYPE LOCALITY: St. Paul Island, Bering Sea. 
HapiraT: On exposed hillsides among cladonias and other lichens. 
DISTRIBUTION: Vermont, Colorado, and St. Paul Island. 
113. Russula fallax Fries, Obs. Myc. 1: 70. 1815. 
Pileus thin, fragile, convex, becoming plane or slightly depressed in the center, 3-5 cm. 
broad; surface vinous-purple in the center, incarnate or Indian-lake on the margin, more or 
Jess olivaceous surrounding the center or even in the center, viscid when moist, with separable 
pellicle, glabrous, margin striate: context white, sometimes tinged like the surface beneath 
the pellicle, acrid, without special odor; lamellae white, equal, adnexed, distant to subcrowded ; 
stipe white, nearly equal, spongy within, 3-5 cm. long, 0.6-1 cm. thick: spores white, sub- 
globose, minutely echinulate, 6 X 6-7 u. 
Type LocALItTy: Europe. 
Hasrrat: In moist places in woods, often in sphagnum moss. 
DISTRIBUTION: Vermont to Michigan and Colorado; also in Europe. 
ILLUSTRATIONS: Cooke, Brit. Fungi pl. 1059; Schaeff. Fung. Bavar. #1. 16, f. 1-3 (as Agaricus 
emeticus). 
114. Russula parvula Burlingham, sp. nov. 
Pileus broadly convex, becoming plane, up to 4 cm. broad; surface very dark violet, 
almost black in the center and black all over when young, becoming paler and brighter colored 
on the margin, viscid when wet, with separable pellicle, pruinose when young, then polished; 
margin scarcely striate: context fragile, tinged reddish under the pellicle, otherwise white, 
slowly acrid; lamellae white, yellowish in drying, dusted with the white spores, equal, simple, 
venose-connected, slightly adnate, close; stipe white, staining sordid-violaceous or dull-red 
where handled or bruised, spongy within, 2.5-4 cm. long, 1 cm. or less thick: spores white, 
globose, echinulate, 7 » in diameter. 
Type collected in needle soil in spruce woods at Stratton, Vermont, August 23, 1910, Gertrude S. 
Burlingham 202-1910 (herb. Burlingham). 
DisTRIBUTION: Known only from the type locality. 
115. Russula crenulata Burl. Mycologia 5: 310. 1913. 
Pileus broadly convex, then plane to depressed, up to 9 cm. broad; surface milk-white or 
slightly yellow, viscid when moist, with pellicle easily separable, glabrous; margin thin, slightly 
striate-tuberculate with age: context fragile, white, very acrid; lamellae white, equal, not fork- 
ing, edges appearing under the lens finely notched or crenate, rounded at the outer ends, 
narrowed behind, close, pruinose; stipe white, spongy, nearly equal or enlarged below, glab- 
rous, spongy within, 10 cm. long, 2 cm. thick: spores white, mostly globose, echinulate, 10 u 
in diameter. 
Type LocaLity: Glen Brook, Oregon. 
Hasirat: In a dense fir forest with a few oaks. 
DIsTRIBUTION: Known only from the type locality. 
DovuBTFUL AND EXCLUDED SPECIES 
Russula amoena Quél. Assoc. Fr. Av. Sci. Compte Rendu 9: 668. 1881. Reported from 
Wisconsin by Denniston in Trans. Wis. Acad. 15:76. 1904. 
Russula aurata (With.) Fries, Epicr. Myc. 360. 1838. Reported from Connecticut by 
White, and from West Virginia and Pennsylvania by McIlvaine. Specimens for verifying 
these reports are not available. It is described in McIlv. Am. Fungi 206. 1900. 
Russula citrina Gill. Rev. Myc. 3°: 5. 1881. Reported from Connecticut by White; 
also reported by McIlvaine. The specimens of this are not available for verification. It is 
described in McIlv. Am. Fungi 203. 1900. 
