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Eukaryota
  Plantae
    Embryophyta
      Polypodiophyta
            Polypodiopsida
                    Polypodiales
                            Cystopteridaceae
                                     Cyclopteris
                                     Cystea
                                     Cystopteris
                                             Cystopteris filix-fragilis
                                             Cystopteris fragilis
                                               Cystopteris fragilis subsp. fragilis
                                                     [Aspidium fragile]
                                                     [Aspidium regium]
                                                     [Athyrium fragile]
                                                     [Cyathea fragilis]
                                                     [Cyclopteris fragilis]
                                                     [Cystea fragilis]
                                                     [Cystopteris canariensis]
                                                     [Cystopteris filix-fragilis f. meridionalis]
                                                     [Cystopteris filix-fragilis subsp. canariensis]
                                                     [Cystopteris fragilis subsp. alpina]
                                                     [Cystopteris fragilis subsp. canariensis]
                                                     [Cystopteris fragilis subsp. regia]
                                                     [Cystopteris fragilis subvar. anthriscifolia]
                                                     [Cystopteris fragilis subvar. cyanopiifolia]
                                                     [Cystopteris fragilis var. acuta]
                                                     [Cystopteris fragilis var. alpina]
                                                     [Cystopteris fragilis var. canariensis]
                                                     [Cystopteris fragilis var. lobato-dentata]
                                                     [Cystopteris fragilis var. pinnatipartita]
                                                     [Cystopteris regia]
                                                     [Polypodium alpinum]
                                                     [Polypodium fragile]
                                                     [Polypodium regium]