Common Name:  Wall-rue

Scientific Name: Asplenium ruta-muraria

Irish Name: Luibh na seacht ngábh

Family Group: Aspleniaceae

This small, short stemmed fern is frequently found in rock-crevices, on the mortar of old stone walls and alkaline rocks, usually growing on vertical surfaces.  Its dull, dark evergreen leaves are thick and in irregular tufts, up to 10cm long and bi- or tripinnate.  The petiole is often longer than the leaf-blade.  The groups of spore-producing structures (sori) on the underside of the leaflets are detectable from June to October.  This is a native plant which belongs to the family Aspleniaceae.

This information is courtesy of http://www.wildflowersofireland.net/