In the south and east it can occur with, or be replaced by, the Parietaria diffusa community (OV41). On walls with a more lime-rich mortar the Asplenium trichomanes - Asplenium ruta-muraria community (OV39) can replace it.
In the southern and eastern areas, this species can coexist or be replaced by Parietaria diffusa community (OV41). In contrast, on walls with a more alkaline mortar, the Asplenium trichomanes - Asplenium ruta-muraria community (OV39) may replace it.