Dryad's Saddle

Polyporus squamosus

"Polyporus squamosus" aka "Cerioporus 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.