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Page number:1212 
Remarks (internal):This is another of the vinaceous-colored species which has hyphae in the cutis, which gives the "apparent amyloid" reaction in Melzer's. The cracking of the pileus is very pronounced in this species and this, together with the lack of odor and taste, distinguish it from H. fuligineo-violaceum. The latter species is acrid and has an odor, and a context which turns blue-green in KOH. In H. simosum only the subcutis turns blue-green in KOH and the flesh has very little odor or taste.
Description type:Original description 
Description:Hydnum rimosum K. Harrison, sp. nov. Fig. 2
Typus: Sm 19288. MICH et DAOM.
Pileus 4-12 cm broad, convex to broadly convex or slightly depressed on disc; margin involute, dry, smooth, then matted fibrillose; surface becoming scaly and often rimose-diffracted, deep "Quaker drab", scales dark "vinaceous fawn" and cracks tinged "army brown", "vinaceous drab" on the margin or with a zone of dark "plumbago slate"; context thick, soft, dry, azonate, unchanging "avellaneous" to "vinaceous buff", odor and taste not distinctive, two collections noted as peppery or faintly acrid. Spines 2.5-7(10) mm decurrent, crowded, "vinaceous buff", "vinaceous fawn" on sterile margin. Stipe 4-8 x 1-4 cm, clavate to equal, fleshy, solid, surface hoary, concolorous with spines, soon sordid "wood brown"; context "vinaceous buff"; base pale violaceous to vinaceous myceloid, grayish internally.
Spores 5-6.5 x 4.5-5 µm, colored, subglobose, finely tuberculate. Some of the young spores attached to sterigmata were reniform. Basidia 6-7 x 15-25 µm, no clamps seen, originating on slender hyphae 2.5-4 µm wide. Context of spines of irregular hyphae up to 7 ), wide, some with resinous contents, mixed with the slender hyphae. Hyphae of the pileus context interwoven, inflated and thin-walled, up to 15 l, in diameter. No clamps seen. Context of the pileus and spines unchanged in KOH and Melzer's solution, but a layer of hyphae 5-9 µm wide, with resinous-appearing contents forms an epicutis on the pileus. Directly beneath this is a layer of hyphae with granules that give the "apparent amyloid" reaction in Melzer's and turn blue-green in KOH.
Habit, habitat, and distribution: Gregarious, under pines (one record of conifers) common locally in the states of Idaho, Oregon, and Washington. Material examined: Idaho, 46191, Oregon, 19288 Type, 8098, 19007, 19088,
19366, 19640, 20001, 23997, 26652, 26686, 26899, 27120, 27152, 27306, 27989; Washington 17737, 17922, 17992.
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