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Page number:477 
Remarks (public):This species was for a long time considered a variety of Phellinus pini but is now recognized as a distinct species. The resupinate to effused-reflexed, thin basidiocarps, the upper tomentum separated by a thin dark layer from the lower context, and the narrower, shorter setae are diagnostic characters of P. chrysoloma. From P. pini it is separated by a thinner basidiocarp, often with a sharp margin, pores on the average smaller than in P. pini (1-2 per mm) and microscopically by the width of the setae (1115 µm in P.pini). The latter species is also most common on Pinus spp.
Cerny (1985) indicated that Daedalea vorax Harkn. is a separate taxon and that many specimens reported as P. chrysoloma from Fennoscandia actually represent D. vorax. Cerny gave no key to the complex but reported the spores of D. vorax to be larger than those of P. chrysoloma (5-6 x 4-5 versus 4-5 x 3.5-4.5 µm). Such a difference is not supported by Jahn (1967) and we have also been unable to confirm the measurements given by Cerny. In his study Cerny did not include a single specimen of P. chrysoloma from Fennoscandia from where the species was described (Uppsala, Sweden). Thus, we are a bit uncertain which specimens he used to obtain the reported spore size.
Description type:Non-original description 
Description:Phellinus chrysoloma (Fr.) Donk, Proc. K. Ned. Akad. Wet. (C) 74:39, 1971. - Polyporus chrysoloma Fr., À–fvers. K. Vet. Akad. Forh. 18:30, 1861. - Fomes abietis P. Karst., Bidr. Kann. Finl. Land Folk 37:242, 1882. - Daedalea vorax Harkness, Pacific Rural press 17:49, 1879.
Basidiocarps perennial or sometimes developing for only one season, effused-reflexed to sessile, often resupinate in early stages of development, imbricate in clusters on standing trees and stumps or often in rows on fallen trees, pilei usually thin and applanate, dimidiate to elongated, up to 5 cm wide; upper surface tomentose to hispid, sulcate, zonate, dull reddish brown to bright yellowish brown at the margin; margin usually undulate, slightly lobed, acute, narrowly sterile below; pore surface bright yellowish brown at first, darkening in older specimens, glancing, the pores angular to slightly daedaleoid, 1-3 per mm in most specimens but smaller (4-6 per mm) in others, dissepiments thin, entire to lacerate; context reddish brown, tough-fibrous, with a thin black layer separating the soft upper tomentum, dense lower layer up to 3 mm thick, upper tomentum up to 1 mm thick; tubes indistinctly stratified, inner surface ochraceous, paler than trama and context, entire tube layer up to 1 cm thick.
Hyphal system dimitic; hyphae of fibrous context thin-walled and almost hyaline to
thick-walled and bright reddish brown in Melzer's reagent, darker brown in KOH, simple-septate, occasionally to often branched, closely interwoven into a compact tissue, 2-4 µm in diam; hyphae of upper tomentum thin-walled and yellowish to thick-walled and bright reddish brown, simple septate, with rare branching, 2-5 µm in diam; dark layer between lower context and tomentum composed of dark, closely interwoven hyphae; basidiospores usually abundant on upper surface and in tomentum; tramal hyphae hyaline to yellowish brown, thin- to slightly thick-walled, simple septate, with rare to occasional branching, 2-3 µm in diam.
Setae abundant, subulate, thick-walled, bright reddish brown in KOH, 30-60 x 7-11 µm. Basidia clavate, 4-sterigmate, 12-16 x 5-6 µm, simple-septate at the base. Basidiospores ovoid to subglobose, hyaline, becoming pale yellowish brown (particularly those trapped in upper tomentum), smooth, negative in Melzer's reagent, becoming slightly thick-walled, 4-5.5 x 4-5 µm.
Chlamydospores scattered in tramal tissue of some specimens; subglobose, ovoid, thick-walled, yellowish brown, 5-5.5 µm in diam. They may represent old embedded basidiospores with thickened walls.
Type of rot. White pocket rot of living and dead conifers, especially spruce in Europe. It also is pathogenic and kills the sapwood, causing stem cankers in which basidiocarps develop (Owens, 1936).
Cultural characteristics. See Owens 1936.
Sexuality. Unknown.
Substrata. Living and dead conifers in all genera of the Pinaceae, usually on Picea, but in Europe also recorded on Abies, Larix and Pinus.
Distribution. Seems to follow Picea in its natural distribution besides a few localities outside that area. It is not known along the western coast of the continent. Circumpolar in the boreal-temperate zone.
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