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Page number:140 
Description type:Non-original description 
Description:Poria andersonii (Ell. & Everh.) Neuman Fig. 125
Wisconsin Geol. Nat. Hist. Survey Bul. 33:57. 1914. Mucronoporus andersonii Ell. & Everh., Jour. Mycol. 6:79. 1890 (NY; BPI; K). Polyporus xanthosporus Underw., Indiana Acad. Sci. Proc. 1893, p. 61. 1894 (NY; BPI; SYRF). Inonotus leei Murr., Western Polypores, p. 21. 1915 (NY; BPI; K; SYRF). Xanthochrous krawtzewii Pilát, Soc. Mycol. France Bul. 49:273. 1934 (PR; IA).
Annual, formed under the bark of an upright tree and inside one or more annual layers, eventually rupturing these tissues and becoming exposed, widely effused, up to 6 mm thick, inseparable, without distinctive odor or taste; margin more or less yellowish brown or sometimes whitened, more or less membranous, sometimes wide; pore surface yellowish brown, in age often becoming reddish brown and sometimes white-incrusted, dull,
in part the tubes becoming whitened within, rigid, elongated to 2 cm or more because of the vertical position of the substratum, pores round to somewhat angular, 2-4 per mm, edges moderately thick, entire; context light yellowish brown, lustrous, soft, fragile, zonate, very thin under the tubes, elsewhere up to 7 mm thick, continuing unchanged into the trama.
Tissue blackening and producing a conspicuous yellow stain in KOH; hyphal system dimitic, the context of skeletal hyphae which are rarely branched, thin- or rather thin-walled, occasionally simple-septate, mostly 3-5 µm in diameter, and of similar generative hyphae except much more branched and hyaline; trama continuous with the context and the hyphae similar; setal hyphae rare to abundant, 4-8 µm in diameter; hymenium 10-14 µm; thick; setae usually abundant but immersed and often inconspicuous, subventricose to ventricose, 12-26 x 5-9 µm; basidia clavate, 10-14 x 6-8 µm; spores always abundant, sulphur yellow in mass, pale to distinctly yellowish brown under the microscope, smooth, IKI -, oblongoval to broadly oval, 5-8 x 4-5.5 µm.
On angiosperms, especially oak and hickory, from Pa. south and west to the Plains, and in Cal., Ariz., Oregon, Europe and in Asia; associated with a white rot. The fruiting body has a habit and structure similar to that of P. obliqua which differs in having larger and less distinctly colored spores, scarce (if present at all) setal hyphae, and in not producing a stain in KOH. Inonotus nidus-pici in Europe is also similar but has pores 6-8 per mm and does not produce a stain in KOH.
Poria andersonii is the designated type for the genus Xanthoporia Murr. The spore deposit of the species was described as Corticium pactolinum Cooke & Harkn., Grevillea 9:81. 1881, according to a letter from L. Bonar.
This fungus is an important agent in top rot of oak, according to Campbell and Davidson (Mycologia 31:161-168. 1939), Genaux and Kuenzel (Iowa Exp. Sta. Res. Bul. 269. 1939), Davidson and Vaughn, U. S. D. A. Tech. Bul. 785, p. 41. 1942, and Cerny in Ceskâ Myk. 17:1-8. 1963.
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