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Page number:67 
Description type:Non-original description 
Description:PHELLINUS IGNIARIUS (L. ex Fr.) Quél. Ench. Fung. p. 172. 1886. Polyporus igniarius L. ex Fr., Syst. Myc. 1:375. 1821.
Fomes igniarius (L. ex Fr.) Kickx, F1. Crypt. Flandres 2:237. 1867. Basidiocarps perennial, sessile or rarely effused-reflexed, ungulate or sometimes applanate, up to 11 x 20 x 8 cm; upper surface gray or blackish, glabrous, sulcate, becoming deeply rimose, incrusted; margin concolorous and glabrous or yellowish brown, (Saccardo's Umber or Snuff Brown); pore surface pale cinnamon brown to dark purplish brown, the pores circular, 5-6 per mm, with thick, entire dissepiments; context dark reddish brown, zonate, woody, up to 2 cm thick; core absent or present next to substratum, with white tissue intermixed; tube layers concolorous with context, the tubes white-stuffed, in indistinct layers, each up to 4 mm thick.
Contextual hyphae of two types, some brown in KOH, thick-walled, distinct, with rare branching, aseptate, 2-5 µm in diam, some hyaline, thinwalled with occasional simple septa, very indistinct; tramal hyphae similar, 2-3 µm in diam.
Setae ventricose to subulate, abundant to rare, 14-17 x 4-6 µm; core setae present in some specimens, irregularly lobed and branched; thickwalled, up to 15 µm in diam.
Basidia broadly clavate, 4-sterigmate, 9-10 x 6-7 µm.
Basidiospores broadly ovoid to subglobose, hyaline, smooth, thickwalled, negative in Melzer's reagent, acyanophilous, 5-6.5 x 4.5-6 µm. Type of rot - Uniform white rot of the heartwood of living hardwoods. Cultural characteristics - See Campbell (1938), Niemald (1977), Nobles (1948, 1958, 1965), and Verral (1937).
Substrata - Acer, Alnus, Arbutus, Betula, Castanopsis, Cornus, Malus, Prunus, Pyrus, Quercus, Rhamnus, Salix, Sambucus.
Distribution - AK, AT, BC, CA, CO, ID, MT, OR, UT, WA, and WY. Voucher specimens - RLG 8575; RLG 5844 (ARIZ).
Remarks - The Phellinus igniarius complex has been another difficult taxonomic problem. Phellinus arctostaphyli is segregated on the basis of characters detailed under that species. Phellinus tremulae occurs only on aspen and is morphologically distinct on the basis of basidiocarp macro- and micromorphology as well as cultural characters. Phellinus pomaceus is most similar and is characterized mainly by small basidiocarps on Prunus. Niemelä (1972, 1974, 1975, 1977) should be consulted for a detailed discussion of the P. igniarius complex.
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