Family
Cystopteridaceae
Cystopteris fragilis. Photo: (c) Muriel Bendel, some rights reserved (CC BY-NC)
Cystopteridaceae are a family of ferns in the eupolypods II clade of the order Polypodiales, class Polypodiopsida. They include four genera: Acystopteris, Cystoathyrium, Cystopteris, and Gymnocarpium. Gymnocarpium and Cystopteris have been found to be sister to the remaining Eupolypods II.
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