See posted comparison photo
slower growth than I would have expected
also posting nearby Physconia isidiigera or P. enteroxantha
would have thought P. enteroxantha more likely in this location, but more resembles P. isidiigera (coarseness of soredia, etc.) in other photos online
walking California Ave (busy street) in W Seattle today (3/24/2019) surprised to see fair amount of Physconia on street trees (guess it just wasn't on my radar before) - will get specimen to determine species
amount of soralia (polluted area?) for both interests me
unless I got identification wrong for the Physconia the amount of soralia seems very large vs. other photos I find online