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 Add this item to the list  Hydnellum diabolus Banker.
Page number:39 
Remarks (internal):As indicated by the numerous specimens examined, H. diabolus is quite abundant in the southern Appalachian Mountains. During the study, however, only one fresh collection of this species was found occurring in a pure stand of Pinus virginiana.
Hydnellum rhizopes, which has a depressed pileus, is a smaller form of H. diabolus, which is normally characterized by a convex to plane pileus. I discussed this variation with Dr. Kenneth Harrison, who showed me basidiocarps ranging continuously from convex to plane and depressed, and from very thin sporophores, as in the forma of H. rhizopes to very thick sporophores as in H. diabolus. The spores, strigose hairs of the pileus, acrid taste and colors are identical for H. rhizopes and H. diabolus, and from all this information, the author is confident that H. rhizopes is conspecific with H. diabolus.
Another species often confused with H. diabolus is the acrid tasting species Hydnellum peckii which is found in the northeastern and western United States (Harrison, 1968). I have not collected H. peckii in the southern Appalachian Mountains, nor have I seen any herbarium material of this species from this geographical range. Harrison (1968) believes the two are separate species. Based on the examination of the type specimens of both names (Baird, 1986), I concluded that the two are distinct. The pileus of H. peckii is not strigose hairy as is that of H. diabolus. In addition, the pileus of H. peckii is glabrous and the pileus surface may be highly colliculose or scrobiculate at the disc. However, Maas Geesteranus (1975) observed the types of both species and placed H. diabolus in synonymy under H. peckii.
Description type:- 
Description:Hydnellum diabolus Banker.
Sporophore single to gregarious. Pileus up to 12.0 cm broad, convex to plane or depressed, subvelutinous to spongy tomentose, later matted to glabrous, often pitted, rarely colliculose, strigose hairy becoming appressed in age, white (6Al), orange white (6A2), reddish white (BA2), madeira (8E5) to reddish brown (9E5) or bruises black ("White", "Sea Shell Pink" to "Pale Pinkish Cinnamon" or "Chestnut Brown"); red droplets present; context up to 1.5 cm thick, slightly duplex nearest the stipe, zonate, pliant when fresh, hard or woody when dry, white (6A1) to reddish white (8A2) or brownish orange (7C5), madeira (8E5) to reddish brown (9E5) in the inner layer located nearest the stipe, light brown colored mottling present; taste acrid peppery; odor of hickory nuts. Stipe up to 5.0 x 2.2 cm, central, terete to attenuate below to a bulbous or radicating base, subvelutinous or spongy tomentose, later matted to glabrous, concolorous with pileus or with whitish mycelium often covering the radicating bases; context duplex, zonate, concolorous with pileus flesh, often with light brown mottling in the central layer. Spines up to 4.5 mm long, decurrent, crowded, white (8A1) to reddish white (8A2) or reddish brown (8D6) ("White" to "Pale Pinkish Cinnamon" or "Vinaceous Tawny"). Chemical reactions: context tissue blue green in KOH or, NH4OH. Pileus trama hyphae up to 5.0 (8.0) Fm diam, uninflated, interwoven in spongy subsurface layer, parallel in the inner duplex layer, clamped; gloeoplerous-like hyphae up to 6.3 Fm diam. Stipe hyphae up to 5.0 :m diam, uninflated, interwoven in the central layer, clamped; gloeoplerous-like hyphae up to 6.3 Fm diam. Spine trama hyphae up to 4.0 :m diam, uninflated, unclamped. Basidia 20.0-40.0 x 4.0-6.0 :m (X= 28.81 ± 3.81 x 5.37 ± 0.76 :m), clavate, unclamped, 4-spored; sterigmata 3.0-5.0 :m long (X= 4.06 ± 0.91 :m).
Basidiospores (4.0) 4.5-6.5 x 3.5-4.5 (5.0) :m (X= 5.09 ± 0.54 x 4.12 ± 0.38 :m), subglobose, brownish; ornamentation tuberculate, not prominent, flattened to rarely exsculpate; hilar appendage oblique.
Terphenylquinones: Atromentin and Thelephoric acid.
Distribution: occurs in eastern North America (Smith and Smith, 1973); specimens examined: North Carolina, Tennessee.
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