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/