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Page number:56 
Remarks (internal):The peculiar habitat, the small, grayish basidiocarps, and the large, fusiform spores are the distinguishing features of this species. 
Description type:Non-original description 
Description:Polyporus rhizophilus Pat. Fig. 16 Journ. Bot. 8:219, 1894. P. cryptopus Ell. & Barth., Erythea 4:79, 1896. Basidiocarps annual, stipitate; pilei circular, up to 3 cm in diameter and 4 mm thick; upper surface ivory to greyish, azonate, glabrous, rugose, margin concolorous; pore surface ivory to tan, the pores angular, 1-2 (3) per mm, with farinose, entire or slightly lacerate dissepiments, tube layer concolorous with the context, up to 2 mm thick; context whitish, azonate, soft-corky, up to 2 mm thick; stipe central to slightly eccentric, simple, concolorous with the pileus in the upper part, dark brownish-black and glabrous below, underground portion rootlike, up to 2 cm long and 3 mm thick, shrinking considerably when dry.
Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, with clamps, occasionally branched, 3-7 µm wide; contextual skeleto-binding hyphae hyaline, thickwalled, dextrinoid, 2-5 µm wide; tramai hyphae similar. Basidia clavate, 4-sterigmate, 25-38 x 7-8.5 µm, with a basal clamp. Basidiospores spindle-shaped to cylindric, 8-11 x 3.5 µm.
Cultural characteristics. Unknown.
Substrata. Terrestrial, fruiting on the ground in pastures or steppe habitats where it is attached to dead grass roots. Recorded on Agropyron, Calamagrostis, Chrysopogon, Cynodon, Elymus, Elytrigia, Festuca, Poa, and Stipa. The last genus seems to be the favourite.
Distribution. The species is rare and known only from the grasslands of central and southern Europe, Morocco, central Asia and central United States.
 
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