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Page number:271 
Remarks (public):Similar to F. palustris but differing in the narrowly cylindric, slightly curved basidiospores. 
Description type:Non-original description 
Description:Fomitopsis durescens (Overh. ex Lowe) Gilbn. & Ryv., comb. nov. Basionym: Polyporus durescens Overh., ex Lowe, Mycotaxon 2:65, 1975.
Basidiocarps annual, sessile, pilei single or imbricate, up to 13 x 6 x 6 cm; pileus surface cream colored to pale buff, drying tan, glabrous to minutely tomentose at the margin, smooth to slightly rough, pore surface white to cream colored, ochraceous on drying, the pores circular to angular, 4-5 per mm, with thick, entire dissepiments, context white to ivory, tough fibrous-corky when fresh, drying very hard and rigid, azonate, up to 4.5 cm thick, tube layer concolorous or slightly darker than context, drying hard and rigid, up to 5 mm thick.
Hyphal system trimitic, contextual generative hyphae with clamps, thin-walled, nonseptate, hyaline, with rare branching, 2.5-5.5 µm in diam, contextual skeletal hyphae thick-walled, hyaline, nonseptate, with rare branching, 2.5-5.5 µm in diam, contextual binding hyphae thick-walled, hyaline, nonseptate, much branched, 2-4 µm in diam, tramal hyphae similar.
Cystidia absent, fusoid cystidioles present, not projecting, thin-walled, 14-16 x 5-6 µm, with a basal clamp.
Basidia clavate, 4-sterigmate, 15-17 x 5-6 urn, with a basal clamp. Basidiospores narrowly cylindric, slightly curved, hyaline, smooth, IKI-, 6-8 x 1.5-2.5 µm.
Type of rot. - Brown cubical rot of dead hardwoods.
Cultural characteristics.- Unknown.
Sexuality. - Unknown.
Substrata. - Dead hardwoods (3, 69, 75, 153).
Distribution. - Central hardwood and southern oak-pine forests from New York south to Louisiana.

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