It’s imgur, pretty unpleasant website.

They're pretty out of focus but it looks like a curtain crust Stereum sp.. The underside should be flat or slightly wrinkly without any gills, pores, or spines.

I'd give iNaturalist a go:

https://www.inaturalist.org/

Possibly lichen? Looks similar to the light green stuff I saw on trees in Arkansas growing up.

Beautiful, that's what it is

Sorry can't be of much help but thanks for sharing

If Stereum doesn't check out you could take a look at Plicatura.