I think this is a Chicken of the Woods mushrom, Laetiporus sulphureus. If I'm right it doesn't bode well for this tree. The site I used to identify it says that it is a heart rot mushroom so if it is on the tree, the "chickens have indeed gone home to roost" and it means the end of the tree. It is a pretty cool fungus and rather large, and on a neighbors tree, not one of mine.
It's a beautiful thing!
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