Hymenochaete rubiginosa (Dicks. ex Fr.) Lév. Borstenschichtpilz Oak Curtain Crust. Fruit body forming densely crowded, tiered brackets, very rarely resupinate, 2.5–6cm across, 2–4cm wide, often wavy or lobed at the margin; upper surface closely concentrically zoned deep rust-brown to date-brown, velvety at first becoming smooth and almost black with age. Fertile or lower surface rust-brown. Flesh thin, rust-brown, brittle. Spores whitish to yellowish or olive, broadly elliptic, 4–6.5 x 2.5–3um. Setae 43–80 x 5.5–10um, dark brown to almost black, thick-walled, acutely fusoid or lanceolate projecting beyond the current basidial layer but some becoming buried in the thickening hymenium. Habitat virtually restricted to occurrence on very old rotting oak-stumps. Season all year. Common. Not edible. Found In Europe.