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Page number:78 
Remarks (internal):According to Eriksson and Ryvarden (1976). Mycoacia can be described as a genus comprising species with a distinctly hydnoid hymenial surface, but its microscopical features totally agree with those of Phlebia. Furukawa (1974) recognized the following four species as members of Mycoacia: M. chrysella (Berk. & Curt.) Furukawa (Hydnum chrysella Berk. & Curt), M. chrysorhiza (Torrey) Aoshima & Furukawa (Hydnum chrysorhizon Torrey), M. copelandii (Pat.) Aoshima & Furukawa (Hydnum copelandii Pat.) and M. himantia (Schw.) Miller & Boyle (Hydnum himantia Schw.). Among them. H. chrysorhizon and H. copelandii belong to Phanerochaete (see p.45) and Radulodon (see p. 93). respectively. Hydnum himantia is placed in Kavinia that is a genus of Gomphaceae (Parmasto, 1986). Furukawa (1974) described M. chrysella based on the specimen (F-11198, TFM) that lacks clamps in the tramal hyphae. However, all the other species of Mycoacia always bear a clamp connection at every septum. Therefore, I exclude M. chrysella from the Japanese species of Mycoacia. 
Description type:Non-original description 
Description:MYCOACIA Donk, Meded. Ned. Mycol. Ver. 18-20: 150. 1931.
Type species: Mycoacia fuscoatra (Fr.: Fr.) Donk.
(? Hydnum fuscoatra Fr.)
Basidiomata resupinate, adnate, effused, ceraceous; hymenial surface hydnoid; aculei conical or cylindrical, apically tapering, mostly 1-3 mm in length, sometimes penicillate at the apex; margin thinning out, indeterminate, sometimes pruinose or fimbriate under the lens (x 20). In section subhyaline to pale brown, ceraceous. Hyphal system monomitic; hyphae 2-3 µm in diam, smooth, thin-walled, nodose-septate, compactly arranged in the trama of the aculei, sometimes encrusted; cystidia (leptocystidia) present or lacking: basidia narrowly clavate, with a basal clamp, producing 4 sterigmata; basidiospores narrowly ellipsoid, cylindrical or allantoid, smooth, thin-walled, non-amyloid, non-cyanophilous.
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