From this picture this could be a few things, but I am leaning toward Laetiporus Cinncinatus (one type of chicken of the woods) very late in the season after the color has gone out of it. But it could also be something like a black staining polypore. If you go back earlier in the season next year and it's bright orange you would be able to confirm that it is one of the types of chicken of the woods (Some type of Laetiporus). I say Cinncinatus because it is growing out of the ground next to the tree, but it could just as easily be Sulphureous attached to a root that has died or something.