Cystopteris diaphana
Encyclopedia
Diaphanous Bladder-fern Cystopteris diaphana (Bory) Blasdell is a fern
Fern
A fern is any one of a group of about 12,000 species of plants belonging to the botanical group known as Pteridophyta. Unlike mosses, they have xylem and phloem . They have stems, leaves, and roots like other vascular plants...

 in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Cystopteridaceae
Cystopteridaceae
Based on recent cladistic evidence, Cystopteridaceae should be construed as a separate family due to its basal position, sister to all other polypodioid ferns. This clade includes only the genera Acystopteris, Cystopteris and Gymnocarpium. Woodsia is a more advanced species.The ferns in this...

.

Status in Britain

The species was found for the first time in Britain
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 in February 2000 on the banks of the River Camel
River Camel
The River Camel is a river in Cornwall, UK. It rises on the edge of Bodmin Moor and together with its tributaries drains a considerable part of North Cornwall. The river issues into the Celtic Sea area of the Atlantic Ocean between Stepper Point and Pentire Point having covered a distance of...

in Cornwall (Murphy & Rumsey, 2005).
)
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