98 
NEW YORK STATE MUSEUM 
Collybia nigrodisca n, sp. 
Pileus thin, convex, glabrous, whitish or smoky white with a brown 
or blackish disk, flesh white; lamellae rather broad, subdistant, 
rounded behind, adnexed, whitish inclining to creamy yellow; stem 
equal, hollow, pruinose, even or but slightly striate, whitish; spores 
subelliptical, .00024 to .0003 in. long, .00016 broad. 
Pileus 1 to 1.5 in. broad; stem 1 to 1.5 in. long, about 2 lines thick. 
Sandy soil. Wading River, Suffolk county. July. 
In size and in the character of the lamellae this plant bears some 
resemblance to Marasmius oreades, but in other respects it is far dif¬ 
ferent. 
Collybia uniformis n. sp. 
Pileus thin, hemispherical or convex, glabrous, hygrophanous, 
grayish-brown when moist, paler when dry, the thin margin even, at 
first involute or strongly incurved; lamellae narrow, crowded, 
rounded behind, nearly free, whitish; stem equal, glabrous or slightly 
pruinose, hollow, grayish-brown, with a slight white mycelioid 
tomentum at the base; spores minute, subglobose, .00012 to .00016 
in. broad. 
Plant caespitose; pileus 3 to 6 lines broad; stem about 1 in. long, 
1 line thick. 
Among mosses on much decayed wood. Saranac Lake. Sept. 
The species belongs to the tribe Confertipedes and is related to 
C. acervata , C. Familia, etc. The plants are quite regular and uniform 
in size and shape. 
Pleurotus mastrucatus Fr. 
Decaying wood. Bethlehem, Albany county. September. This 
species is very rare with us, but it is well marked by the gelatinous 
upper stratum of the pileus. 
Lactarius serifluus Fr. 
Woods. Port Jefferson, Suffolk county. July. 
The plants referred to this species in Report 24, p. 74, proved to be 
distinct and were published in Report 28, p. 50, under the name Lac¬ 
tarius aquiduus. The plants now under consideration agree well with 
the description and figures of L. serifluus and are believed to be the 
true species. 
