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Page number:131 
Description type:Non-original description 
Description:Hydnochaete olivacea (Schwein.: Fr.) Banker Figs. 2, 4, 5, 17
Banker, Mycologia 6 (5): 234 (1914); Ryvarden, Mycotaxon 15: 433, f. 3 (1982); Jung, Wood-rott. Aphyll. s. Appal. 131, f. 41, pl. 16 C, 26 E; Gilb. & Ryvarden, N. Am. Polypores 1: 351, f. 168 (1986). - Sistotrema olivaceum Schwein.: Fr., Schr. Naturf. Ges. Leipzig 1: 101 (1822). - Hydnum olivaceum (Schwein.: Fr.) Fr., Elench. fung. 134 (1828). - Sistotrema fuscescens Schwein., Schr. Naturf. Ges. Leipzig 1: 102 (1822). - Hydnoporia fuscescens (Schwein.) Murrill, N. Am. fl. 9 (1): 3 (1907). - Irpex cinnamomeus Fr., Epicr. 524 (1838).
Basidiome annual (?), effused or effuso-reflexed, closely adnate, coriaceous, woody when dry, 500-2800 µm thick, round, 5-25 cm in diam; reflexed margin (pileus) short (up to 2 mm) and broad. Hymenophore warted or hydnoid with irregular, round to flattened teeth, obtused to incised in the top, often antlerlike with a fused base; length of teeth 0.5-2.5 mm; hymenium not cracked, in fertile specimens Cinnamon or reddish Brown (M: 7.5 YR 5/6-10; K & W: 5 C 5-8, topaz to brownish yellow), rusty brown in sterile and old specimens (K & W: 6 D 7-8, light brown), without olive or lilac tint; resupinate margin fibrillose or abrupt, lighter coloured (M: 7.5 YR 8/6-8 to 7/10 when older), then concolorous with hymenium, pale cinnamon to rusty brown or ferruginous.
Tomentum and cortex absent, or cortex present in old specimens as a black zone next to the substrate; context composed of hyphal layer, or setal layer only with setae scattered throughout; dark line above the hymenium absent.
Hyphal layer to 300 µm thick, rusty brown, homogeneous (without a dark line); hyphal system dimitic; setal hyphae present; generative hyphae 1.5-3 µm in diam, yellowish, with thickened walls, moderately branched, with scattered septa; skeletal hyphae dominating, yellow to pale rusty brown, 3-5 µm in diam, thick- or very thick-walled to solid; there are also a few hyphae of transitional type with very rare septa; in context and hymenium crystalline matter absent.
Setae numerous, 60-200 x 8-15 µm, projecting to 50 µm, fusiform-subulate, with acute tip, straight, naked, without incrustation.
Hyphidia, cystidia and basidioles absent; basidia clavate or subclavate, 6-12 x 4-5 µm; sterigmata 4; spores cylindrical to allantoid, 5-6 x 1.2-2 µm.
SUBSTRATA IN N. AMERICA. On dead branches, often still attached to the trees.
TYPE STUDIED. Sistotrema olivaceum: USA, Pennsylvania, Salem, 540 (UPS, isotype).
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