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Page number:217 
Remarks (public):C. perennis in Europe can only be confused with C. cinnamomea but normally the latter has a much softer and darker, shiny pileus and lacks the dichotomously branched cuticular hyphae typical of C. perennis. 
Description type:Non-original description 
Description:Coltricia perennis (L.:Fr.) Murr. - J. Mycol. 9:91, 1903. - Boletus perennis L.. Sp. Plant. p. 1177. 1753. - Polyporus perennis L.:Fr.. Syst. Mycol. 1:350, 1821.
Basidiocarps annual. stipitate, pilei more or less circular, often confluent with adjacent specimens when growing in groups. up to 10 cm in diam, 2-5 mm thick at center. tough and coriaceous when fresh, brittle and hard when dry; upper surface of pileus velvety-tomentose, pale cinnamon to deep brown, becoming greyish with age. usually densely zonate. often with slightly different tomentum from one zone to another, reflecting changing growth conditions; margin thin and wavy, bent down in dry specimens; pore surface golden brown, cinnamon to dark brown in old specimens. pores angular, 2-4 per mm. often slightly decurrent on the stipe, with age sometimes slightly incised or dentate, dissepiments thin; context 1 -2 mm thick. rusty brown and dense, paler towards the pileus; tube layer up to 3 mm thick. cinnamon to rusty brown.
Hyphal system monomitic; with two types of generative hyphae. both with simple septa; a) predominantly straight. sparingly branched. wide, rusty brown, 4-8 µm wide, in most sections with numerous septa, 2-3 µm in diam; b) twisted, pale yellowish and narrow, with few septa. these hyphae especially common in the context and the central part of the stem; hyphae on pileus surface thick-walled, erect. with distinctive dichotomous antler-like branching, pale yellowish brown. 3-8 µm in diam.
Setae and other sterile hymenial elements absent.
Basidia clavate, 4-sterigmate. 15-25 x 5-7 µm. simple-septate at the base. Basidiospores ellipsoid to cylindric-ellipsoid. pale yellowish brown in KOH. smooth, slightly dextrinoid in Melzer's reagent, 6-9(-10) x 3.5-5(-5.5) µm.
Type of rot. Terrestrial, evidently not a wood-rotting fungus.
Cultural characteristics. Unknown.
Sexuality. Unknown.
Substrata. On the ground in conifer forests. more rarely in mixed or hardwood forests. often on exposed soil in places such as paths. roadsides, clearings, in vicinity of fireplaces. etc. It has been proven that the species is mycorrhizal (Davidson 1984). Distribution. Following Pinus everywhere in Europe except on calcareous ground.
Circumglobal in the conifer zone and rather common, north to Finnmark in Norway at 70°N.
Taxon name: