The "Dryad's Saddle" fungus, a.k.a. "Hawk's Wings", spotted in Gilbert Park in Downers Grove, Illinois. It is a basidiomycete bracket fungus, with common names including pheasant's back mushroom as well. 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 of colors on the bracket matching that of a pheasant's back.
Photo captured October 22, 2016.
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