This is actually Salix reticulata - female. Net-vein willow.
Thank you, Larry. Canada Post currently has a 'Canadian weather' series of stamps out, one of which features a nice full halo. That shot was taken in about the same area, by Frank Reardon. It seems to be a good spot for the phenomenon.
Wonderful picture of the week that you took, too.
Oops, the wooly bear transforms into a moth, not a butterfly. The Isabella Tiger moth.
Wonderful image. These amazing creatures live up to fourteen years before transforming into a butterfly!
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