Cystopteris diaphana

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.

Regional Distribution

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.

Threats

Unknown.

Conservation

The River Camel is a SAC and most of the site lies on Forestry Commission land.