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Page number:29 
Description type:Non-original description 
Description:castanea, Fomitopsis Imaz., Bull. Gov. Forest Exp. St. Tokyo 42:1, 1949.
Kitasaku, Nagano, Japan, 9 Oct. 1947, leg. R. Imazeki (type, TFM- F-346; isotype in TNS).
=Melanoporia castanea (Imaz.) Hattori & Ryvarden comb. nov., basionym as cited above.
Basidiocarp sessile, occasionally resupinate, perennial; pileus triquetrous, ungulate or irregular, up to 30 cm long, up to 15 cm thick, margin thick and dull, pileus surface chestnut brown and velutinous in young specimens, almost black and glabrous in old specimens; tubes multizonate, purplish brown, pore surface dark umber to purplish brown, pores circular, 5-6 /mm; context fibrous-corky, purplish brown.
Hyphal system dimitic, contextual generative hyphae hyaline, 1.5-4 µm wide, with clamp connections; contextual skeletal hyphae olivaceous brown in KOH, 3-5.5 gm wide, thick to almost solid, unbranched to occasionally branched; tramal generative hyphae hyaline to pale yellow, 1.5-3 µm wide, with clamp connections; tramal skeletal hyphae olivaceous brown in KOH, almost straight, thick to almost solid, 3-5 µm wide; cystidia none. Type sterile, so following descriptions of basidia and basidiospores were made based on TFM-F-15770. Basidia clavate, 15-20 x 4.5-5 µm, 4-sterigmate, with a basal clamp, basidiospores long ellipsoid, hyaline, IKI-, 4-5 x 1.8-2.5 µm (Fig. 1).
Remarks: This species is closely related to Melanoporia nigra (Berk.) Murr. (basionym Polyporus nigra Berk., K, BPI!) with its purplish brown context and brown rot. Thus, Imazeki & Hongo (1989) reduced it to a synonym of M. nigra. However, M. nigra has a consistently resupinate basidiocarp while M. castanea usually has a well developed pileus. Besides, the context hyphae of M. nigra are much wider than those of M. castanea.
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