Family : Aspleniaceae.

Rusty back fern.

The young fronds emerge covered with white scales. In time, this mature to a rusty colour. Sori with linear indusia are along veins and concealed by the abundant cloak of scales. It is happy in chalky or acidic walls or gravel with sun or light shade. It can't stand stagnant water. Evergreen. Height : 5/15cm. Hardiness : -20°C.