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 Add this item to the list   Hydnellum ferrugineum (Fries:Fries) Karsten.
Page number:49 
Remarks (internal):No fresh collections of this species were obtained and the associated tree species cannot be determined. Harrison (1964) stated, however, that H. pineticola (=H. ferrugineum) was to be found under coniferous tree species.
Maas Geesteranus (1975) placed H. pineticola as a synonym of the European occurring species H, ferrugineum. Harrison, however, believes that the immature stage of H. pineticola is somewhat different from that of the other species. He is convinced that the juvenile basidiocarps of H. pineticola are never covered entirely with a thick white tomentum, as is the case with H. ferrugineum (Maas Geesteranus, 1975. Pl. 21.). However, I observed a colored photo by Harrison in his 1961:52 publication that was labelled as Hydnellum velutinum var. spongiosipes. He crossed out this name in pen and replaced it with H. pineticola. The photo shows a thick white tomentose layer on the pileus surface. Because of this photograph and the same micro- and macromorphologies, I consider this species as contaxic.
A southern Appalachian species with which H. ferrugineum may be confused is H. spongiosipes. Hoth have been .reported throughout the eastern United States. These species have similar brownish colors (refer to the descriptions in this section) and the basidiocarps have approximately the same shape. There are, however, differences that may be used to separate the two. In H. spongiosipes, the context of the pileus is obviously duplex, dark to blackish brown and azonate, whereas H. ferrugineum has a light brown context and is zonate. Also, H. ferrugineum is generally thought to occur under coniferous tree species and sporophores of H. spongiosipes under deciduous trees.
Description type:Non-original description 
Description:Hydnellum ferrugineum (Fries:Fries) Karsten.
Sporophore single to gregarious. Pileus up to 7.5 cm broad, velutinous to spongy tomentose, later becoming matted, smooth to rarely colliculose, grayish brown (5B3) to fawn (7E4) or light brown (7D5); context up to 1.0 cm thick, not obviously duplex, but may be seen nearest the stipe, zonate, pliant when dry, light brownish colored stippling nearest the stipe, concolorous with the pileus; taste mildly bitter; odor none. Stipe up to 5.0 x 2.5 cm, central, ventricose or attenuate below to a subbulbous or bulbous base, velutinous to spongy tomentose below or matted above, light brown (7D5) to concolorous with the pileus; context duplex, zonate, stippling present, concolorous with pileus flesh. Spines up to 4.0 :m long, decurrent crowded, concolorous with the pileus. Chemical reactions: context tissue blue green in KOH or NH4OH. Pileus trama hyphae up to 6.0 :m diam, uninflated, interwoven in subsurface layer, subparallel below, unclamped; gloeoplerous-like hyphae up to 6.0 :m diam. Stipe hyphae: up to 5,5 :m diam, uninflated, interwoven in subsurface layer, parallel at the center, unclamped; gloeoplerous-like hyphae up to 6.0 :m diam. Spine trama hyphae up to 5.0 (6.0) :m diam., uninflated, unclamped. Basidia (25.0) 27.0-36.0 x 5.5-7.0 (7.5) :m (X= 31.38"2.92 x 6.03"0.72 :m), clavate, unclamped, 4-spored; sterigmata 4.0-5.0 (6.0) :m long (X= 4.53"0.33). Basidiospores (4.5) 5.06.0 x 4.0-5.0 :m (X= 5.24"0.41 x 4.44"0.35 :m), subglobose, brownish; ornamentation tuberculate, prominent, flattened to exculpate; hilar appendage oblique.
Terphenylquinones: Atromentin, and Thelephoric acid.
Distribution: occurs throughout eastern United States and in Canada (Smith and Smith, 1973); specimens examined: North Caroline.

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