I don't see an usnic acid tint to the photos, so I suspect that this is Punctelia rather than Flavopunctelia. For reasons we don't understand our Punctelia seems to be associated with urban/suburban areas, occasionally in agricultural or foothill areas. What to call the local urban/suburban species is still a matter of some debate, but it can be called P. subrudecta s.l. or one of the more specific names proposed for it.

Hi Richard & others-

Yes, interesting observations. Here in Eugene, OR I've only seen Punctilia subrudecta s.l. once. It was in a pocket of mature seral PSME within city limits.

Similarly I've been running into Flavopunctelia flaventior in the Willamette Valley. Once on a mature birch outside the Salem BLM office and twice within Eugene. Uploaded photos include a habitat shot outside Roosevelt Middle School.

It did not escape my notice that these landscaped situations that they are growing in are subjected to exceptional spore dispersal mechanisms such as lawnmowers, weed eaters, and leaf blowers.

Happened by (my doctor located nearby) Punctelia subrudecta almost exactly one year later - posted comparison photo.

will add more information (have to go)

responding to Dave - (not disagreeing) what 1st came to mind for my posted lichens is possible influence of pollution (on busy arterial streets) possibly causing soredia increase (seem to see that on other species in the city, e.g. Evernia prunastri, Platismatia glauca)

Looked around for more P. subrudecta - doesn't seem to be reproducing nearby. However, the Physconia is on many nearby trees, and noticed some on trees on walk into center of downtown.