TYPE STUDIES IN THE HYDNACEAE^— 
V. THE GENUS HYDNELLUM. 
Howard J. Banker 
Hydnellum Diabolus sp. nov. 
Hydnum carbimcuhis (Seer.) Banker, Mem. Torrey Club 12; 
151. 1906; not Hydnum carbunculus Seer., ]\Iye. Suis. 2: 
515- 1833. 
Hymenophore terrestrial, mesopodous, gregarious, more or less 
eonfluent, low, nearly sessile, broad ; pileus eonvex to plane, rarely 
slightly depressed in eenter, more or less uneven, somewhat round 
to irregular, 4-10 em. wide and by eonfluenee often 20 eni. wide; 
surfaee wooly pubeseent, often more or less floeeose squamulose, 
azonate, whitish at first turning slightly brownish with irregular 
blotches of dark-brown to nearly black where bruised, these latter 
spots more or less glabrous, shining, probably from the dried 
juice; substance fibrous, tough, spongy, grayish-brown in the 
upper part of the pileus, compact, hard, somewhat woody, more 
or less distinctly zonate in the lower part, exuding a thick red 
juice in the fresh plant; margin somewhat thick, obtuse, sub- 
fertile to sterile ; stem stout, very short, deformed, becoming bul- 
bous in tbe substratum, and sometimes subradicating, 1-3 cm. 
wide, I mm. to i cm. long above ground ; teeth slender, terete, 
tapering, acute, decurrent, pinkish white, less than 5 mm. long 
shortening to the margin, about 3-5 to a sq. mm. ; spores ovoid, 
tuberculate, brownish, 4-5.5 /x wide; hyphae of pileus hyaline, 
smooth, thin-walled, collapsing when dried, recovering quickly in 
KOH, forming a somewhat intricate tangle but with a decided 
tendency to run longitudinally, separable in KOH, septate with 
simple clamp-connections, segments extremely long, slender, uni- 
form, 3-4 /X wide, branching diffuse; odor of hickory nuts, strong; 
taste intensely acrid. 
On the ground under conifers in autumn. 
The type specimen of this species was collected at Mt. Desert, 
* Investigation prosecuted with the aid of a grant from the Esther Herr- 
inan Research Fund of the New York Academy of Science. 
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