This was a huge mushroom, probably about 12" wide
Very large shelf fungi!
On living sugar maple
I would naively guess Dryad's Saddle, but am not sure
Polyporus squamosus is a basidiomycete bracket fungus, with common names including dryad's saddle and pheasant's back mushroom. It has a widespread distribution, being found in North America, Australia, Asia, and Europe, where it causes a white rot in the heartwood of living and dead hardwood trees. The name "dryad's saddle" refers to creatures in Greek mythology called dryads who could conceivably fit and ride on this mushroom, whereas the pheasant's back analogy derives from the pattern...