White variant, the center is still red, so you can tell it is not the Large white, plus the leaf vein pattern is different.
At the annual OCVN state conference
Chicken Mushroom (Laetiporus sulphureus) - near the Rock House, Hocking Hills, Ohio - August 2011.
Comma to left of other butterflies.
Second picture shows Comma sitting on Tiger Swallowtail.