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Page number:57 
Description type:Non-original description 
Description:PHELLINUS CHRYSOLOMA (Fr.) Donk. Proc. K. Ned. Akad. Wet. (C) 74:39. 1971.
Polyporus chrysoloma Fr., Ofvers. K. Vet. Akad. Forh. 18:30. 1861. Basidiocarps perennial or sometimes developing for only one season, effused-reflexed to sessile, often resupinate in early stages of develoµment, 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 daedaloid, 1-3 per mm in most specimens but much smaller (4-6 per mm) in others; dissepiments thin, entire to lacerate; context reddish brown, tough-fibrous, with a thin black layer separating the softer 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.
Hyphae of fibrous context thin-walled and almost hyaline to thickwalled and bright reddish brown in Melzer's reagent, septate, occasionally to often branched, closely interwoven into a compact tissue, 2-4 µm diam; hyphae of upper tomentum thin-walled and yellowish to thickwalled and bright reddish brown, septate, with rare branching, 2-5 µm 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, septate, with rare to occasional branching, 2-3 µm diam.
Setae abundant, subulate, thick-walled, bright reddish brown in KOH, 25-60 x 7-10 µm.
Basidia clavate, 4-sterigmate, 10-12 x 5-6 µm.
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 to ovoid, thick-walled, yellowish brown, 5-5.5 µm diam.
Type of rot - White pocket rot of living and dead conifers. Phellinus chrysoloma also is pathogenic in true firs, killing sapwood, and causing stem cankers in which basidiocarps develop (Owens, 1936). Cultural characteristics - See Owens, 1936.
Substrata - Pinus, Pices, Abies, Larix.
Distribution - Probably present in all western states and provinces. Voucher specimens - JPL 607; RLG 11508 (ARIZ).
Remarks - This has been considered a variety of Phellinus pini but is now recognized as a distinct species by Donk (1974), Ryvarden (1977) and others. 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.
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