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Page number:551 
Remarks (public):Superficially, basidiocarps of Podofomes trogii are similar to those of Ischnoderma spp., as already pointed out by Pouzar (1971), Jahn (1973) and David et al (1983). The brown, zoned tomentose pileus with an underlying blackish crust is found in both genera. Typically in both genera the pileus shrinks by drying and becomes characteristically radially folded or wrinkled. The context is wood brown in both species and they both have clamped generative hyphae. As to hyphal system there are differences (see below) and the same goes for the spores. Domanski et al. (1967) studied the type species in detail and transferred it to Ischnoderma while Szczepka and Sokol (1986) published a monographic study of the genus. 
Description type:Non-original description 
Description:PODOFOMES Pouzar - Ceska Mykol. 20: 174, 1966.
Basidiocarps annual, centrally to laterally stipitate; pileus dark brown with a fine tomentum, often in concentric zones, with age disappearing exposing a black crust; stipe round to flattened, often irregularly and with an uneven surface, dark brown and as the pileus with a crust under a fine tomentum; pore surface whitish when fresh, becoming brown on drying; pores small; tubes concolorous with pore surface; context of pileus fibrillose, that of stem more compact, wood coloured; hyphal system di- to tri-mitic; generative hyphae with clamps; skeletal hyphae present in context, trama and stipe, unbranched to sparingly branched in context and trama, pale yellowish brown, in the stipe the vegetative hyphae are more branched being similar to the binding hyphae of the Bovista type; cystidia none; basidia 4-sterigmate with a basal clamp; basidiospores hyaline, thin-walled, negative in Melzer's reagent. Causes a white rot. On calcareous ground from roots or on stumps of Abies. Monotypic genus with one Central European and West Asian species.
Type species: Polyporus corrugis Fr.
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