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Page number:1127 
Remarks (internal):The dextrinoid reaction of the vegetative hyphae makes this species easy to recognize. 
Description type:Non-original description 
Description:Dichomitus cavernulosus (Berk.) Masuka & Ryvarden comb. nov.
Basionym: Polyporus cavernulosus Berk., Hooker's J. Bot. 8: 235 (1856). - Megasporoporia cavernulosa (Berk.) Ryvarden, Mycotaxon 16: 174 (1982).
Basidiocarps resupinate, annual, adnate and coriaceous to hard, up to 2 mm thick; margin narrow, white to cream; pore surface concolorus or becoming pale woody brown in age, pores angular and shallow, 2-4 mm-1, up to 1 mm deep, dissepiments finely fimbriate in actively growing specimens; context white to ochraceous, less than 1 mm thick. Hyphal system dimitic; generative hyphae with clamps, thin-walled and 2-4 µm wide; arboriform skeletal hypha common, thick-walled to solid, lower part unbranched and flexuous, 2-4 µm wide, upper part branched, solid and strongly dextrinoid, especially in the lower part. Basidia clavate, four-sterigmate, 25-35 x 5-8 µm, with a basal clamp. Dendrohyphidia present, but difficult to find in old and dry specimens, delicately thin-walled and variably branched in the upper part, most common along the dissepiments, up to 25 µm long. Basidiospores cylindrical, hyaline, thin-walled and negative in Melzer's reagent, (10-)12-16 x 5-7 µm.
Substrate. On hardwoods.
Distribution. Widespread in tropical America and Africa, but we have not seen specimens from Asia.

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