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Page number:154 
Description type:Non-original description 
Description:Poria contigua (Pers. ex Fries Karst. Fig. 140
Rev. Mycol. 3, 9:19. 1881. Polyporus contiguus Pets. ex Fries, Syst.
Myc. 1:378. 1821. Boletus contiguus Pers., Synop. Meth. Fung., p. 544. 1801. Polyporus suberis Dur. & Mont. in Montagne, Syll. Crypt., p. 162. 1856 (PC; FH). Polyporus floccosus Fries, Hym. Eur., p. 572. 1874 (isotype-S).
Perennial, becoming widely effused, up to 2 cm thick, usually inseparable, without distinctive taste; extreme margin bright yellow and radiate-fibrillose, within bright yellowish- or reddish-brown, tomentose, rather narrow; pore surface pale reddish brown or grayish, dull, the tubes white-lined, rather soft-corky, up to 6 mm long in each indistinct layer, pores angular, 2-3 per mm, edges thin, entire; context reddish brown, silky, soft-fibrous, up to 0.7 mm thick, continuing unchanged into the trama.
Tissue intensely reddish brown in KOH, the tubes darker, without stain; hyphal system dimitic, the context predominantly of skeletal hyphae which are rarely branched, rather thin-walled, infrequently simple-septate, 2-3 (-4) µm in diameter, and with rare generative hyphae which are infrequently branched, thin-walled, simple-septate, 1.5-3 µm in diameter; tramal tissue continuous with that of the context and of similar hyphae; hymenium 12-15 A thick; setae subulate to subventricose, 50-100 ("-135", Bresadola) x 5-14 µm,; basidia clavate, 12-14 x 5.5-7 µm, or "9-18 x 4-9 µm" (Bourdot & Galzin) ; spores hyaline, smooth, IKI -, oblong to subelliptical, 3.5-6 x 2.5-3 µm, or "4-6-7 x 3-3,5-4,5 µm" (Bourdot & Galzin).
On angiosperms and gymnosperms in Jamaica, Cuba, Brazil, Paraguay, Europe, Algeria, and recorded from Asia and N. Zealand; associated with a white rot. This species is characterized by its large pores, the white crystalline lining of its tubes, and the large setae. µm is probably most easily confused with Fomes viticola which differs especially by its more slender spores, 5-9 x 1.5-2 µm, and more slender setae 25-80 x 5-11 µm. Poria bicolor Bres., from Brazil, may be this species but the synonomy is uncertain as the type of P. bicolor is sterile. Poria racodioides (Pets.) Bres., as understood in Europe, appears to be this species. Poria cryptacantha (Mont.) Cooke, from Brazil, is also very similar, but seems to differ in having smaller pores, 4-5 per mm, and generally more slender setae mostly 6-8 µm wide. P. ferruginosa is also somewhat similar but that has smaller pores, 4-5 per mm, and much smaller setae, 25-45 x 5-9 µm.
Although the name Poria contigua has been applied to many North American specimens collected in temperate areas, all such specimens so far seen are better assigned to other species, mostly to F. viticola. As P. contigua is well-known in Europe, the descriptions and comments by European mycologists should be consulted, e.g., Bondarzev (1953, p. 403), Bourdot and Galzin (1928, p. 624), Donk (1933, p. 257), and Pilát (1942, p. 536).
Poria contigua has been selected several times as the type for the genus Ochroporus Schroet.
 
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