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). References diaphana Ferns of Europe Flora of Southwestern Europe Flora of Great Britain Flora of Italy Flora of the Azores