Physconia_grisea? phaeophyscia orbicularis?

 Physconia_grisea? phaeophyscia orbicularis?

Observation - Physconia_grisea? phaeophyscia orbicularis?. Description: Grey-green lichen found on Lime tree, soredia in center of thallus (rosette like form). I found two other lichens (second and third photos) on the same tree that appear to be the same species, but am not sure.

Grey-green lichen found on Lime tree, soredia in center of thallus (rosette like form). I found two other lichens (second and third photos) on the same tree that appear to be the same species, but am not sure.