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Page number:57 
Remarks (internal):Basidiocarps of Polyporus squamosus are not equalled in size by those of any other polypore treated here. This and the scaly pilear surface is usually sufficient for a determination. P. tuberaster normally grows on the ground from a sclerotium and its stipe cuticle is embedded in an amorphous matrix, as are the pilear scales, which become erect and fimbriate with age (Jahn 1969). P. Tetirugis (Bres.) Ryv. is considered a synonym of P. squamosus. It was described with spores up to 20 mm, and a smoother pilear surface with adhering scales. Both characters are commonly found in P. squamosus, and were previously been reported in the literature (Gilbertson & Ryvarden 1987).
 
Description type:Non-original description 
Description:Polyporus squamosus Huds.:Fr. Fig. 17 Syst. Mycol. 1:343, 1821. Boletus squamosus Huds., Flora Angl. ed. 2, p. 626, 1778. -P. michelii Fr., Syst. mycol. 1:343,1821.. P. flabelliformis Pers., Mycol. Europ. p. 53, 1825. P. infundibuliformis Rostk. in Sturm (ed.), Pilze Deutschl. 10:37, 1830. Favolus boucheanus Kl., Linnea 8:318, 1833. Polyporus rostkovii Fr., Epicris Syst. Mycol. p. 439, 1838. P. alpinus Sauter, Hedwigia 15:33, 1876. Bresadolia paradoxa Spegaz., Arg. 16:277, 1883. Trametes retirugis Bres., Ann. Inst. Bot. Roma 5:177, 1894. Polyporus squamatus Kalchbrenner in Lloyd, Lloyd Mycol. Writ. 3:84, 1911. P. mcmurphyii Murr., Western Polyp. p. 12, 1915. Leucoporus lepidus Pat., Bull. Soc. Mycol. Fr. 33:52, 1917. Polyporus westii Murr., Bull. Torrey Bot. Cl. 65:651, 1939.
Basidiocarps annual, laterally to centrally stipitate, pilei dimidiate, reniform, or circular, up to 18 cm wide and 5 cm thick, solitary or caespitose; upper surface pale buff with a thin, blackish-brown pellicle that breaks up to form dark scales, azonate, margin concolorous; pore surface buff to light brown, the pores angular, 1-2 per mm, dissepiments becoming lacerate, tube layer concolorous with the context, up to 1 cm thick, decurrent on the stipe down to the black basal portion; context pale buff, corky, azonate, up to 4 cm thick, brittle when dry; stipe black and minutely tomentose at the base.
Hyphal system dimitic; contextual generative hyphae hyaline, thin-walled, with clamps, 3-4.5 µm wide, forming a palisade of free hyphae on the stipe surface and a cuticle on the pilear surface; contextual skeleto-binding hyphae thick-walled, hyaline, with occasional branching, some dentrically branched with branches tapering to 1-2 µm, 4-7.5 µm wide, swollen to 22 µm; tramal hyphae similar, monomitic in young specimens. Basidia clavate with a narrow base, 4-sterigmate, 40-70 x 9-12 µm, with a basal clamp. Basidiospores subellipsoid, 14-17 x 5-6 µm.
Cultural characteristics. See Nobles 1948, 1958, 1965; Bakshi et al. 1969; Stalpers 1978.
Substrata. Living hardwoods, also frequently found fruiting on stumps or dead standing or fallen trees, once also collected on dead Larix.
Distribution. Cosmopolitan species, but most common in the temperate and boreal zones.
 
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