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 south and east, it can co-occur or be replaced by the Parietaria diffusa community (OV41). Alternatively, on walls with a more lime-rich mortar, the Asplenium trichomanes - Asplenium ruta-muraria community (OV39) may replace it.