Hi there, More details and/or a closer photo would be needed to try for an ID on this. eg. Is it hard or rubbery? Does it start to shelve out or is it always flat to the surface it is on? Visible pores or flat surface (or other structures)? It makes me think of Peniophora but that is a bit of a wild guess based on what I can see, and noting that I'm from a different region. cheers, frog
