Yellowing Curtain Crust

Yellowing Curtain Crust (Stereum subtomentosum – Wikipedia) is a tough, leathery bracket fungus that grows on dead hardwood, identified by its velvety, zoned, often greenish-brown cap and a distinct yellow staining reaction on its smooth underside when bruised or cut. Found year-round, it commonly causes white rot on dead beech and oak wood.