Hi,
Don’t take this as being a certainty, as I’m not very good with crusts either – but to me, this has the general look of Schizopora paradoxa – Split Crust.
Basidioradulum radula – Toothed Crust looks quite similar too, (but I think that one often has teeth more akin to Hedgehog Fungus).
I think microscopy would be needed to be anything like sure.
Regards,
Mike.