Splash of colour in the woods

This was just a small patch of yellow on a tree trunk, found when several of us spent a few hours botanizing Susan Wright's land, south of Calgary, on May 19th. The weather was so overcast that most of the photos I took on that outing didn't come out, and this one is a little blurrier than I would have liked. Fascinating lichen, but I don't know the ID, unfortunately.

Thanks, Doug (dougwaylett) for the ID, "a very wet, thus green coloured, Xanthomendoza hasseana".