Identification: Help to id this fugus.

We found this today on our maple. Please help we love the tree. We do not want to lose it!

 

Please post a photo that will enlarge so that people can get a better look. See
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Lets see if I did this right?

 

Sorry, I can't identify this fungus, but it appears to be one of the crustose fungi, which are typically wood-rotting. If this is growing on the main trunk of the tree, it is probably impossible to save it. Pictures of the entire extent of the crusts would be helpful.