I can say with 100% certainty this is not E. glandulosa, it forms fused globs that have conspicuous glands on the surface, not the foliose structures seen here. I am still thinking lichen, although the substrate would seem to make Peltigera highly unlikely. Leptogium on the other hand could be a good fit.
http://lichenportal.org/portal/taxa/inde...
http://www.mushroomexpert.com/exidia_gla...
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