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According to Esslinger: Phaeophyscia pusilloides is “rarely on rock”, Physciella chloantha “occasional” and P. melanchra “less often”. As your recent Physcia aipolia and P. stellaris show, even ones that are supposedly never on rock (Moberg doesn’t even admit the possibility in the Sonoran Flora vol. I), manage to go there from time to time. Just to completely demolish all the rules, even a species like Flavoparmelia baltimorensis which is never supposed to grow on trees, I have found on bark once. Lichens are the original anarchists. Is there any rule they don’t break at some point?? Second law of thermodynamics maybe…
It’s one of those common lichen here on rock that tend to escape attention due to their very small size and cryptic colors (it’s hard to make them stand out in photos too). There are some soralia that are lip-shaped – those tend to be on the lobes closer to the other edge. But most of the soralia are pompon-like, sitting on lobe tips on the inner thallus or just seemingly sticking out of the thallus. Lower surface is black, with black rhizines forming entangled mat.
Oops! I see Jason’s already posted some comments :-)