Cystopteris diaphana

Cystopteris diaphana, the greenish bladder-fern or diaphanous bladder-fern, is a fern in the family Cystopteridaceae.

Distribution
It is found locally on the Atlantic seaboard of Europe.

Status in Britain
The species was found for the first time in Britain in February 2000 on the banks of the River Camel in Cornwall (Murphy & Rumsey, 2005).