No. 115.] 55 
destructive to the wood on which it grows, causing it to become 
soft, brittle and even friable. 
HYDNUM VELATUM, B. &C. 
Decaying wood of poplar, Populus tremuloides. Gansevoort. 
September. 
HYDNUM SUBFUSCUM, N. sp. 
Resupinate, thin, soft, the margin and subiculum beneath white, 
tomentose, sometimes extended into branching strings of mycelium, 
the upper surface of the subiculum pale yellowish-brown or dingy- 
isabelline, when magnified, appearing as if sprinkled with minute 
shining particles; aculei slender, subulate, very acute, white when 
young, then with white tips or wholly colored like the sudiculum. 
Decaying wood of deciduous trees. Conklingville. September. 
In Z. himantia, which, in’some respects, this species resembles 
the teeth are described as obtuse and pulverulent. 
“ HYDNUM CARBONARIUM, N. sp. 
Resupinate, very thin, at first floccose-pruinose and white, then 
smoky-brown, sometimes retaining a white margin; aculei at first 
short, then longer, subulate or cylindrical, minutely ciliate at the 
apex, whitish when young, then smoky-brown. 
Charred wood. Elizabethtown. September. The species is easily 
recognized by its peculiar color and by the ciliate or setulose tips 
of the teeth. It appears as if it had been smoked or scorched. 
IRPEX AMBIGUUS, N. sp. 
Resupinate, adnate; subiculum very thin, flocculose-pruinose, 
white, becoming pallid with age; aculei oblique, somewhat united 
at the base, minute, very variable, subulate and entire, or com- 
pressed, acute, truncate, branched, incised or subserrate, white 
when young, becoming pallid with age. 
Decaying beech wood and bark. Adirondack mountains. 
September. — 
It forms small irregular or interrupted patches. To the naked 
eye it resembles Hydnum pallidum, but the teeth are more or less 
united at the base, thus requiring it to be placed in the genus 
Irpex. Scarcely any two of them are exactly alike. 
POROTHELIUM PAPILLATUM, N. sp. 
Effused, very thin, flocculose-pruinose, white when young, soon 
pallid or isabelline, subwaxy and often rimose, the margin subin- 
