134 



Mycologia 



Russula praeumbonata sp. nov. 



Pileus fleshy, conical then expanding, with a large umbo, up 

 to 5.5 cm. broad, surface scarlet-red to Nopal-red or ox-blood 

 red on the umbo, glabrous, viscid when wet, with cuticle separable 

 half way to the center; margin becoming widely striate-tubercu- 

 late ; context white, unchanging, brittle, without special odor, mild 

 in taste; lamellae white, equal, simple, finely serrulate, venose- 

 connected, adnate ; stipe white, tapering upwards, very brittle and 

 fragile, stuffed, becoming hollow, up to 10 cm. long by 1 cm. 

 thick ; spores pure-white, broadly ellipsoid, very echinulate, apic- 

 ulate, 6.2-8.75 X 8.75-10 p. 



Type Locality : Stow, Massachusetts, Simon Davis. 

 Habitat: In a swamp under deciduous and coniferous trees, 

 September. 



Distribution : Stow, Massachusetts, Newfane, Vermont, and 

 Magnetewan, Ontario, Canada. 



This is related to R. purpurina and R. uncialis, but differs from 

 both in the presence of an umbo, in the more distant lamellae, the 

 absence of red on the stipe, and the larger, more ellipsoid and 

 more echinulate spores. From R. purpurina it differs further in 

 that the lamellae remain nearly white even in drying, while in R. 

 purpurina they become decidedly yellow. Three collections were 

 made from the type locality in 191 7 and one in 1918. 



Late in August, 1919, I collected in Newfane, Vermont, two 

 specimens of apparently the same species. The taste of these 

 seemed to be at length slightly bitter as did the specimen found at 

 Magnetewan. 



556 Lafayette Avenue, 

 Brooklyn, New York 



Explanation of Plate 7 



Fig. 1, 5. Russula simulans. 

 Fig. 2. Russula ornaticeps. 

 Fig. 3. Russula viridi-oculata. 

 Fig. 4. Russula Hibbardae. 

 Fig. 6. Russula redolens. 



