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. Frond length up to 12cm.
Found growing in the crevices of old walls or rocks, mainly where there is limestone. Widespread but commonest in W Britain and Ireland.
Photographs of Wall-rue Spleenwort (Asplenium ruta-muraria), taken December 2012, local canal bridge, Staffordshire. © Pete Hillman 2012. Camera used Nikon Coolpix P500.