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Page number:55 
Description type:Non-original description 
Description:P. radicatus Schw. Fig. 16 Amer. Phil. Soc. Trans. II, 4:155, 1832. P. morgani Peck, N.Y. State Mus. Ann. Rep. 32:34, 1879. P. kansensis Ell. & Barth., Erythea 4:1, 1896.
Basidiocarps annual, centrally stipitate, solitary; pileus circular, flat to depressed, 310 cm in diameter, 3 mm to 1 cm thick, upper surface yellowish to sooty brown, scurfy; pore surface white when fresh, drying ochraceous to pale yellowish-brown, pores angular, 1 to 3 per mm, tubes brittle when dry; context white to cream, firm to brittle when dry, up to 1 cm thick; stipe 5-15 cm long, up to 2 cm thick, concolorous or darker than the pileus, scurfy to squamulose, elongated below the ground to a black root.
Hyphal system dimitic; generative hyphae clamped, thin-walled and hyaline, up to 8 µm wide, forming a palisade on the stipe surface and a cutis on the pilear surface; skeleto-binding hyphae inflated in the context up to 12 µm, 2-6 µm wide in the trama. Basidia clavate, 4-sterigmate, 25-35 x 8-12 µm. Basidiospores subellipsoid to fusiform, 12-15 x 6-8 µm.
Cultural characteristics. Unknown.
Substrata. On the ground, probably from buried roots or from sclerotia.
Distribution. North America, Mexico.
Remarks. The species is very closely related to Polyporus squamosus, sharing with it the basidiocarp consistency, stipe and pilear hyphal structure, and spore size. However, the pileus is always scurfy in P. Tadicatus and the pores tend to be smaller.
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