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I did consider the Scalycaps but they tend to have lighter caps than the one you have illustrated. There is so much variation, of course, and it may me a species we don't get over here.
Tropical lichens (Venezuela 2011) just to compare:
My little persimmon stump had a glorious good-bye this year:
Could be a Cotinarius? img. 1020078. Birch polypore, piptoporus betulinus img. 1020082.
Birch polypore is called "knivkjuke" in Norwegian. If you insert your steel knife into the polypore the knife doesn't rust!Picture from this site: http://murul.no/KIM/brukskniver.html