Description:
Basidiomata medium to very large. Pileus up to 80 mm diam, subhemispherical, convex, plano-convex to applanate; margin decurved, sometimes revolute when old; surface dry, nearly glabrous, yellowish brown, brown to dark brown, sometimes to black; context about 15 mm thick in the center of the pileus, light yellow, sometimes bluing when scratched. Hymenophore poroid, depressed around apex of stipe; pores yellow, almost to round, yellowish brown, about 0.3 mm diam, unchanging in color when scratched; tubes 10–15 mm in length, yellow, unchanging in color when scratched. Stipe 8–10 × 2.5–4 cm, central, subcylindrical or subclavate, solid, base slightly enlarged; surface dry, nearly glabrous, brown to brownish black; context light yellow, unchanging in color when scratched; annulus absent; basal mycelium yellow.Basidiospores 5.5–7 × 4.5–6 μm, broadly ellipsoid, slightly thick-walled, yellowish brown in 5% KOH. Basidia 18–30 × 10–14 μm, clavate, thin-walled, 4-spored, colorless in 5% KOH. Hymenophoral trama composed of thin- to slightly thick-walled hyphae, 2.5–8 μm wide, colorless to light yellow in 5% KOH. Clamp connections present in all tissues.
Reference:
(Berk. & Broome) Boedijn (1951). Sydowia5: 218.
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