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My best, biggest (65 feet tall?) oldest hard Maple tree has an old large wound, painted over about 4 feet off the gorund. Right now there is a nice, white 9" in dia. mushroom emerging from that wound. Does this spell doom for the rest of the tree?
Trying to ascertain overall health of tree - thus request for "whole tree" image.
That wound appears to be closing reasonably, albeit slowly since it was large. I think you just have a mushroom indicating decay of the interior wood, since it was exposed by the wounding. This is quite common in trees, and not a reason to expect to lose the plant.
The sharp V crotch shown would be more likely a reason for sudden massive failure, since that is indicative of poor structure.