Possibly lichen? Looks similar to the light green stuff I saw on trees in Arkansas growing up.
this post was submitted on 13 Sep 2025
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Mycology
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Don't think this is a lichen, seems to be a shelf fungus.
Beautiful, that's what it is
Sorry can't be of much help but thanks for sharing
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.
If Stereum doesn't check out you could take a look at Plicatura.
It’s imgur, pretty unpleasant website.