REPORT OF THE DIRECTOR I918 53 



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 subiculimi beneath white, 

 tomentose, sometimes extended into branching strings of mycelium, 

 the upper surface of the subicultmi 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 subiculimi. 



Decaying wood of deciduous trees. Conklingville. September. 

 In H. 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; subiculimi 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 ba'rk. Adirondack mountains. Sep- 

 tember. 



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, sub waxy and often rimose, the margin subin- 



(55) 



