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Page number:303 
Remarks (public):Widespread in Europe north to Porsanger at 70° N in Norway. Circumboreal in the north temperate zone, North Africa, Asia and North America. Also known from the mountains in tropical Africa.
Remarks. The species is usually easy to recognize by its cinnamon coloured, sappy basidiocarp with a vivid violet reaction in KOH caused by polyporic acid.
 
Description type:Non-original description 
Description:Hapalopilus nidulans (Fr.) Karst. - Rev. Mycol. 3:18. 1881. - Polyporus nidulans Fr.. Syst. Mycol. 1:362, 1821. - Poly pores rutilans Pers.:Fr., Syst. Mycol. 1:363, 1821. - Boletus rutilans Pers., Icon. Descrip. p.18. 1798.
Basidiocarps annual, pileate, broadly sessile to effused-reflexed, mostly convex, often almost triangular in section, up to 10 cm wide and long, but usually smaller, up to 4 cm thick at the base, soft and watery when fresh. light and somewhat brittle when dry, all parts of the basidiocarp light violet to purplish-red with KOH; upper surface cinnamon to ochraceous, at first finely tomentose to scrupose with small adpressed tufts of hyphae, soon completely smooth, azonate or with a few broad, weakly sulcate zones, the inner ones usually smoother than the distal ones. margin acute and entire; pore surface ochraceous to cinnamon brown, usually with a distinct sterile edge towards the substrate and margin, pores thin-walled, angular, 2-4 per mm. the pore surface often with a few large cracks in larger basidiocarps; context light cinnamon, mostly distinctly paler in colour towards the pileus, soft and fibrous and quite brittle when dried, up to 4 cm thick at the base; tube layer up to 10 mm thick. ochraceous or whitish due to cottony sterile hyphae.
Hyphal system monomitic; generative hyphae hyaline, with clamps, in the context large, up to 10 µm in diam and with conspicuous clamps, distinctly thick walled and richly branched. mostly smooth, but also covered partly with amorphus substances mixed with polygonal, light pinkish to brownish crystals; tramal and subhymenial hyphae more straight and narrow, up to 6 µm in diam.
Cystidia none; fusoid cystidioles variably present, 18-22 x 4-5 µm, with a basal clamp. Basidia clavate, 4-sterigmate, 18-22 x 5-6.5 µm, with a basal clamp.
Basidiospores ellipsoid to cylindrical, hyaline. thin-walled, smooth, negative in Melzer's reagent. 3.5-5 x 2-2.5 (-3) µm.
Type of rot. Causes a white rot of dead hardwoods.
Cultural characteristics. Unknown.
Sexuality. Unknown.
Substrata. Dead hardwoods such as Acer, Aesculus, Alnus, Betula, Carpinus, Corylus, Fagus, Fraxinus, Malus, Populus, Prunus, Quercus, Robinia, Sambucus, Salix, Sorbus and Tilia, rarely on conifers like Abies, Picea and Pinus. In North Europe especially common on Cory/us and Sorbus, in Central Europe most common on Quercus spp.
 
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