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Page number:285 
Remarks (public):The species is normally easy to recognize in the field because of the dark brown pileus and the often greenish white irregular hymenophore becoming dark brown and split with age. It may be confused with Hydnochaete species, but basidiocarps of these are in general more rusty brown and microscopically distinguished by simple septate generative hyphae and above all, by long, acute and dark brown setae (see Ryvarden 1982 for a description of the American Hydnochaete species). 
Description type:Non-original description 
Description:Fuscocerrena portoricensis (Fr.) Ryv. Fig. 136.
Trans. Br. Mycol. Soc. 79:280, 1982. - Polyporus portoricensis Fr., Elench. Fung. 1 :1 15, 1828. - Irpex farinaceus Fr., Linnaea 5:523, 1830. - Irpex coriaceus Berk. & Ray., Grevillea 1:101, 1872. - Cerrenella subcoriacea Murr., North Am. Fl. 9:72, 1908. For further synonyms, see Ryvarden op.cit.
Basidiocarps annual to perennial, effused resupinate to reflexed and pile-ate, tough and coriaceous, adnate, up to 1 cm wide, 1-5 cm long, often laterally fused, 1-2 mm thick, upper surface umber to dark vinaceous brown, tomentose, sulcate and zonate, margin dark brown, finely velutinate, sharply delimited towards the substrate, pore surface dark brown to greenish white, irregular, at first poroid, pores angular 1-2 per mm, later the pores split and the hymenophore becomes daedaleoid, sinuous to hydnoid with flattened teeth, often slightly incised, actively growing specimens with greenish-white tube walls with a brown tint while the dissepiments remain brown due to projecting skeletal hyphae, tube walls in old specimens dark brown as the whitish, fine grainy layer disintegrates and the brown color emerges, context and trama dark brown, the former up to 1 mm thick.
Hyphal system dimitic, generative hyphae with clamps, thin-walled, hyaline to faintly yellowish, 2-4 µm wide, skeletal hyphae predominant, dark brown to yellowish brown, thick-walled to apparently solid, usually unbranched, rarely dichotomously branched and in rare cases almost arboriform, in one specimen seen with interhyphal and apical swellings, 2-6 µm wide (swellings to 15 µm wide).
Cystidia or other sterile elements absent.
Dendrohyphidia present in the hymenium, not seen along the dissepiments, up to 22 µm long, with numerous protuberances in the upper part, often covered with fine crystals and their outline may be difficult to observe, more irregularly bottleshaped in the basal part and with a basal clamp.
Basidia clavate, 4-sterigmate, 8-14 x 4-6 µm, with a basal clamp. Basidiospores cylindrical, often slightly bent, 5-7 x 2-2.5 µm, hyaline, thin-walled, IKI-.
Type of rot. - White rot of dead hardwoods.
Cultural characteristics. - Unknown. Sexuality. - Unknown.
Substrata. - On deciduous trees of many kinds (8, 32, 105, 153, 195).
Distribution. Eastern United States from Iowa, Minnesota and New York south to Texas and Florida. Central and South America to Southern Brazil.

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