Similar to Arthonia parietinaria, but the apothecia are present singly or in small clusters of up to five in each infected area. The two species can be distinguished using molecular methods.
The species was assessed as of Least Concern by Woods & Coppins, but a re-evaluation is needed due to probable confusion with Arthonia parietinaria.
Parasitic on thalli and apothecia of Calogaya spp. (Caloplaca s.l.), originally described from Rusavskia (Xanthoria) elegans but not reported from that host in GBI. Records on Xanthoria parietina need confirmation; they should probably refer to A. parietinaria.