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Page number:65 
Description type:Non-original description 
Description:PHELLINUS GILVUS (Schw.) Pat., Ess. Tax. Hym. p. 97. 1900. Boletus gilvus Schw., Schr. Nat. Ges. Leipzig 1:96. 1822. Polyporus gilvus Schw., Schr. Nat. Ges. Leipzig 1:96. 1822. Basidiocarps perennial or annual, sessile or slightly effused-reflexed; pilei solitary or imbricate, dimidiate, up to 7 x 12 x 3 cm; upper surface dark yellowish brown (Yellow Ocher to Tawny-Olive), tomentose to glabrous, often ruguse, zonate or azonate; margin concolorous; pore surface dark purplish brown (Natal Brown), the pores circular, 6-8 per mm, with thick, entire dissepiments; context bright yellowish brown, zonate, fibrous, up to 2 cm thick; tramal tissue concolorous and continuous with the context, tube layer white-stuffed, up to 1 cm thick. Contextual hyphae of two types, some dark reddish brown in KOH, thickwalled, rarely branched, simple-septate, 3-7 µm in diam, others pale yellowish brown, thin-walled, with occasional branching, septate, 3-5 µm in diam; tramal hyphae similar.
Setae abundant, subulate, sharp, 20-30 x 5-6 µm. Bastidia broadly clavate, 4-sterigmate, 8-11 x 5-7 µm. Basidiospores ellipsoid to ovoid, hyaline, smooth, negative in Melzer's reagent, 4-5 x 3-3.5 µm.
Type of rot - Uniform white rot of dead wood of hardwoods and a heart rot of living trees.
Cultural characteristics - See Davidson et al. (1942), Nobles (1948, 1958, 1965), and Gilbertson and Burdsall (1972).
Substrata - Alnus, Betula, Fraxinus, Juglans, Phoenix, Platanus, Populus, Prosopis, Prunus, Quercus, and Salix.
Distribution - AZ, CA, ID, MT, NM, OR, and WA. Voucher specimens - RLG 7736; RLG 7180 (ARTZ).
Remarks - Phellinus gilvus is a common fungus on hardwoods along streams at lower elevations in the Southwest. The purplish color of the pore surface is very characteristic. It is most similar morphologically to P. torulosus which occurs at higher elevations on conifers and has larger spores. The two also differ greatly in culture.
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