It is behaving more like fungi I think. Lichen lives gently on top trying to cover a surface. This is a devil inside the tree; only visible at openings in the skin. This tree has fallen over and dead? Tree species? Maybe ask Angel.
It look like Argy,but not from Néstle :-)
I thougth in Xanthoria parietina
what do you think?
https://www.google.pt/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&ved=0CD0QFjAE&url=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FXanthoria_parietina&ei=uTW2UrCzEISO7Qbft4CYAQ&usg=AFQjCNGmAIToIvMn8YGCbtfaueYy6U0vxg&bvm=bv.58187178,d.ZGU
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