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Page number:177 
Remarks (internal):Considerable variation occurs in basidiocarps of P. ferruginosus, especially in pore size. Phellinus ferreus is similar but has narrower basidiospores and lacks setal hyphae.
 
Description type:Non-original description 
Description:Phellinus ferruginosus (Schrad.:Fr.) Bourd. et Galzin,
Hym. France p. 625, 1928. - Polyporus ferruginosus Schrad.: Fr., Syst. Mycol. 1:378, 1821.
Basidiocarps annual, becoming widely effused, tough to soft-spongy, not easily separable; margin tawny, soft-spongy, often appearing setulose under a lens, up to 2 cm wide; pore surface rusty brown, the pores circular, usually 7-9 per mm, but in some unusual specimens 2-3 per mm, with thick, tomentose dissepiments; context yellowish-brown, azonate, soft-fibrous, up to 1.5 mm thick; tube layer slightly darker than the context or concolorous, continuous with the context, up to 2 cm thick.
Hyphal system dimitic, generative hyphae 2-4 µm in diam, skeletal hyphae yellow brown, 2-5 um wide.
Setal hyphae present, easiest to observe in the sterile margin, dark reddish-brown, very thick-walled, tapering to a seta-like point, unbranched, 5-8 µm in diam, up to 150 um long.
Hymenial setae abundant, mostly subulate, thick-walled, brown in KOH, 25-65 x 6-8 µm.
Basidia clavate, 4-sterigmate, 11-14 x 4.5-6.5 µm, simple-septate at the base.
Basidiospores hyaline, cylindric or short-oblong, smooth, negative in Melzer's reagent, 5-7 x 3-3.5 µm.
Substrata. On dead wood of numerous hardwood genera.
Distribution. Cosmopolitan species.
 
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