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Page number:179 
Remarks (public):The species is normally easy to recognize because of the soft and yellowish to sometimes partially bluish basidiocarps and the subglobose, slightly thick-walled spores. Larsen and Zak have split the species into five varieties based on the surface colour. 
Description type:Non-original description 
Description:Byssoporia terrestris (DC.:Fr.) Lars. & Zak - Can. J. Bot. 56:1122, 1978. - Polyporus terrestris DC:Fr.. Syst. Mycol. 1:383, 1821. - Byssocorticium terrestris (DC:Fr.) Bond. & Sing.. Ann. Mycol. 39:48. 1941. Basidiocarps resupinate, annual. soft and separable. effused, up to 3 mm thick, margin usually rhizomorphic to fimbriate, white to pale yellowish; pore surface variable in colour, mostly cream to yellowish or straw-coloured, but often orange to greenish or with purplish patches, when old more brownish. pores angular, sometimes irregular and semi-daedaleoid, 2-3 per mm; subiculum thin and cottony, paler than pore surface: tube layer concolorous with pore surface. up to 3 mm thick.
Hyphal system monomitic; subicular hyphae 2-4.5 µm in diam. with clamps and simple septa, hyphae of the rhizomorphs up to 11 µm in diam; both types of hyphae variably encrusted with rounded to angular granules; surface hyphae of the rhizomorphs often curly to spiral-like, often lobate and contorted with irregular wall thickening; tramal hyphae without clamps, 2-4.5 µm in diam.
Basidia clavate, 4-sterigmate, 15-25 x 5-6 µm. simple-septate at the base. Basidiospores ellipsoid to globose, smooth, slightly thick-walled, hyaline, acyanophilous, negative in Melzer's reagent, 4-5 x 3-4 µm.
Type of rot. Apparently not a wood-rotting fungus; forms mycorrhiza with conifers of many genera.
Cultural characteristics. See Larsen and Zak op. cit.
Sexuality. Unknown.
Substrata. The basidiocarps develop on rotten debris on the ground or on dead wood, mostly brown rotted. of conifers such as Abies. Juniperus, Picea and Pinus. but also noted on hardwoods including Castanea. Populus, and Quercus.
Distribution. Rare species, but widespread in conifer forests of Europe south to Italy and north to the Arctic circle in Fennoscandia. Circumboreal in the warm and temperate zones.
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