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Page number:64 
Description type:Original description 
Description:Phellinidium aciferum Y.C. Dai, spec. nova (Fig. 1)
Basidiocarps perennial, resupinate, inseparable, ca. 100 cm or more in longest dimension, up to 15 mm thick, consistency woody hard, without odour or taste. Margin narrow, up to 1 mm wide, pale brown to dark brown, without mycelial setae. Pore surface umber brown, shining; pores round or angular, rarely sinuous, 4-6 per mm (n=86/3), tube mouths entire (not lacerate as in P. fragrans), corky; dissepiments up to 0.2 mm thick. Subiculum dark umber brown, 0.3-0.4 mm. Tubes similar to pore surface, but young tubes yellowish brown and dark umber brown in the old, fibrous, up to 4 mm long, annual layers distinct.
Hyphal system monomitic; all septa without clamp connections; tissue darkening but otherwise unchanged in KOH.
Subiculum - Besides next to substrate, a new subiculum develops after each annual layer of tubes. Generative hyphae varying from hyaline, thin-walled, branched, frequently septate, 2-3.5(-4) µm in diam (n=37/1), to pale brown, fairly thick-walled, rarely branched, septate, 3-5 µm in diam (n=32/1); all transitions present. Contextual hyphoid setae originating from pale brown generative hyphae, rust brown, thick-walled, unbranched, several hundreds of µm long, 5-6.5(-7) µm in diam (n=38/1) near apex, terminal part slightly broader, usually pointed. Both the hyphae and hyphoid setae IKI-, CB-, interwoven in subiculum.
Tubes - Trama comprising hyphae similar to those in the subiculum; hyphoid setae dominating, more or less parallel, some of them curved and penetrating into hymenium, and resembling hymenial setae, sharp-pointed, subulate, some with crystals, (16-)17-23(-24) x 4-6 µm (n=30/1). Subhymenium distinct, made up of delicate, hyaline hyphae, hymenium and subhymenium dark blue in CB; cystidia frequent, hyaline, very thin-walled, subulate, sharp-pointed, (17-)18-27(-31) x 3-5 µm (n=40/2); basidia clavate, with four sterigmata, (8-)9-14(-15) x 3-4(-5) µm (n=47/2); basidioles clavate, in shape similar to basidia, but slightly smaller.
Spores - Basidiospores cylindrical, thin-walled, hyaline, smooth, IKI-, CB-, (2.8-)3-4(-4.2) x (1-)1.1-1.5 µm, L=3.52, W=1.24, Q=2.74-3 (n=93/3).
Holotype: China. Jilin Prov., Huadian county, Dongxing Forest Firm, on fallen trunk of Ulmus japonica, mixed forest, alt. 800 m, 18.X.1993 Dai 1715 (H).
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