On dead cottonwood log
Keyed from:
Westberg, M., Morse, C. A., & Wedin, M. (2011). Two new species Of Candelariella and a key to the candelariales (lichenized Ascomycetes) in North America. The Bryologist, 114(2), 325-334.
8 spores per acus, ellipsoid, lack of persistent thallus.
Could not get a good photo, but I am looking at the bright green lichen.