Byssomerulius corium, commonly known as the netted crust, is a normally resupinate crust with such an interesting structure. Here are a few thoughts. It has an easily separable basidiome, peeling off like an elastoplast, which seems quite strange really, as it is an outgrowth of the mycelium and presumably needs connection and support.
The central surface tends to become off-white and then gently folded or quite obviously ridged fairly quickly while the margin tends to remain a snowy white and finely fringed. This combination is generally enough to recognise this very common crust. Watch out for the similarly coloured and shaped Basidioradulum radula, the toothed crust, with the more violent disruption of the central surface into teeth up to 5 mm long, and its very close adherence to the substrate.
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