Range & Status
Native; found in Corsica, France, Italy, Portugal, Sicily, Spain and the Azores (Murphy,
Page & Parslow, in prep.). Since its discovery in Cornwall it has been found near Tavistock in Devon and in Ireland.
Found along a short stretch of the lower reaches of the River Camel in North Cornwall, just above the tidal limit (SX06 & SX07). Originally found and recorded as Cystopteris fragilis here in 2000, but re-determination in 2003 confirmed the plants as Cystopteris diaphana ; new to the British Isles.
Habitat & Ecology
On bare muddy places and between tree roots on vertical riverbanks that are subjected to winter flooding, and on nearby damp wooded banks.
The River Camel is a SAC and most of the site lies on Forestry Commission land.