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Page number:88 
Description type:Non-original description 
Description:Poria xantha (Fries) Cooke, sense of Lind Fig. 68
Danish Fungi, p. 389. 1913 (lectotype-S) m Grevillea 14:112. 1886. Polyporus xanthus Fries, Syst. Myc. 1:379. 1821. P. flavus Karst., Svdv. Finl. Polyp., p. 40. 1859 (Hm BPI). P. selectus Karst., Soc. Fauna Flora Fenn. Not. Förh. 9:360. 1868. P. sulphurellus Peck, N. Y. State Mus. Ann. Rept. 42:123 (or 27). 1889 (NYS; BPI; NY). Poria greschikii Bres., Ann. Mycol. 18:38. 1920 (Sm BPI).
Annual, sometimes reviving, becoming widely effused, up to 5 mm thick, not readily separable, extremely bitter; margin white, sometimes darkening slightly on drying, arachnoid to pubescent, narrow; pore surface white to straw yellow or pale yellow with a salmon tint when fresh, drying yellow or in age or in the herbarium fading to white, scarcely glancing, the tubes waxy-soft when fresh, almost cottony-fragile when dry or old tubes chalky, up to 5 mm long, pores rounded, about 5-6 per mm, edges thick, entire; context white, soft, thin, continued unchanged into the trama; tubes lined with a distinct layer.
Tissue not changing color in KOH; hyphal system dimitic, the context above the tubes of skeletal hyphae which are rarely branched, thin-walled to solid, nonseptate, 2.5-5 µm in diameter, at the margin with generative hyphae which are thin-walled, nodose-septate, 2.5-5 µm in diameter; tramal tissue continuous with the context and the hyphae similar; hymenium 13-15 µm thick; cystidioles fusoid, 3-4 µm in diameter; basidia more or less cylindrical, 10-14 x 4-5 µm spores hyaline, smooth, IKI -, allantoid, 4-5 x 1-1.5 µm.
On gymnosperms and angiosperms, restricted in eastern North America to southern Canada and the northern half of the United States and similarly in western North America, in Jamaica, Europe, and in New Zealand; associated with a brown checked rot. This is a destructive decay agent of lumber in use, see Blair in Phytopathology 9:54. 1919 and 10:61. 1920m Cartwright and Findlay in Principal Decays of Softwoods Used in Great Britain, p. 97. 1938m Findlay in Brit. Mycol. Soc. Trans. 34:35-37. 1951m and Davidson and others in Mycologia 39:313-327. 1947. It has been one of the standard fungi used in decay studies with cultures, see Lombard and Gilbertson (1965, p. 72).
Specimens at Stockholm and Kew determined as P. xantha by Fries do not appear to be P. xantha as here described. Their identity is uncertain.
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