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Page number:99 
Remarks (public):The perennial, resupinate basidiocarps with cylindrical basidiospores characterize P. aciferinum within the species group with both setal hyphae and hymenial setae. 
Description type:Non-original description 
Description:Phellinus aciferum (Dai) Nunez & Ryvarden, comb. nov. ; Basionym: Phellinidium aciferum Dai, Ann. Bot. Fennici 32:64, 1995.
Basidiocarps perennial, resupinate, extending for about 100 cm, up to 1.5 cm thick, woody hard, margin narrow, up to 1 mm wide, pale to dark brown; pore surface light umber brown, glancing, pores round to angular, rarely sinuous, 4-6 per mm, dissepiments entire, thick, tubes stratified, sometimes with layers of context in between, individual layers up to 6 mm long; context felty-fibrous, light brown, up to 4 mm thick.
Hyphal system dimitic; generative hyphae simple-septate, hyaline and thin-walled in the trama, branched, up to 3.5 µm wide, in the context pale brown, thick-walled, rarely branched; skeletal hyphae thick-walled, dark brown, present in the trama and context, 3-5 µm wide, straight and scarcely branching.
Setal hyphae dark brown, thick-walled, up to 500 µm long and 6.511M wide, acute, running parallel to the trama, some tiending towards the hymenium, also present in the context.
Hymenial setae dark brown, thick-walled, usually apically encrusted, 16-26 x 4-5 µm, acute, immature setae with thin walls also seen.
Basidia clavate, 9-15 x 3-4.5 µm, with four sterigmata.
Basidiospores cylindrical to slightly allantoid, thin-walled, smooth, hyaline, 3-4(4.5) x 1.5 µm.
Substrata. On dead Ulmus japonica.
Distribution. Only known from the type locality in North China (Changbai).
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