Wall-rue Spleenwort – Asplenium ruta-muraria

Frond length up to 12cm. A delicate little evergreen fern with blueish-green or olive-green, club-shaped leaflets with toothed margins. Brown spores can be seen beneath the bipinnate (twice divided) fronds.

Found growing in the crevices of old walls or rocks, mainly where there is limestone. Widespread but commonest in W. Britain and Ireland.