We posted the pic as a bonus Tuesday Teaser, and here's what we learned from Mickey Rayne:
The site below offers detailed information regarding what is, in fact, the Cedar Apple Rust, as Mike G had wondered earlier. It is a gall and/or fungus disease that attacks crabapples and such.
Elaine and I had just seen it for ourselves during a photo-op walk toward the end of the daylight hours today. We are not certain that it is the same one posted as the "teaser," but it is the same thing.