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  Plantae
    Tracheophyta
           [Tracheobionta]
      Pteridophyta
            Polypodiopsida
                    Polypodiales
                            Cystopteridaceae
                                     Acystopteris
                                             Acystopteris japonica
                                                   [Cystopteris japonica]
                                             Acystopteris taiwaniana
                                             Acystopteris tenuisecta
                                                   [Dryopteris tenerifrons]
                                     Currania
                                     Cystopteris
                                             Cystopteris alpina
                                             Cystopteris bulbifera
                                                   [Aspidium bulbiferum]
                                                   [Filix bulbifera]
                                             Cystopteris diaphana
                                             Cystopteris douglasii
                                             Cystopteris fragilis
                                                   [Cystopteris dickieana]
                                                   [Cystopteris filix-fragilis]
                                                   [Cystopteris fragilis subsp. dickieana]
                                                   [Cystopteris fragilis var. angustata]
                                                   [Cystopteris fragilis var. dickieana]
                                                   [Cystopteris fragilis var. woodsioides]
                                                   [Filix fragilis]
                                               Cystopteris fragilis subsp. diaphana
                                               Cystopteris fragilis subsp. fragilis
                                                     [Aspidium fragile]
                                                     [Cystopteris apiiformis]
                                                     [Cystopteris fragilis f. anthriscifolia]
                                                     [Cystopteris fragilis f. cynapiifolia]
                                                     [Cystopteris fragilis f. magnasora]
                                                     [Cystopteris fragilis subsp. regia]
                                                     [Cystopteris fragilis var. anthriscifolia]
                                                     [Cystopteris fragilis var. apiiformis]
                                                     [Cystopteris fragilis var. cynapiifolia]
                                                     [Cystopteris fragilis var. dentata]
                                               Cystopteris fragilis subsp. huteri
                                               Cystopteris fragilis subsp. tenuifolia
                                               Cystopteris fragilis var. fragilis
                                               Cystopteris fragilis var. huteri
                                               Cystopteris fragilis var. laurentiana
                                               Cystopteris fragilis var. protrusa
                                             Cystopteris laurentiana
                                                   [Cystopteris tennesseensis subsp. laurentiana]
                                             Cystopteris membranifolia
                                             Cystopteris millefolia
                                             Cystopteris montana
                                             Cystopteris moupinensis
                                                   [Cystopteris mairei]
                                             Cystopteris protrusa
                                             Cystopteris reevesiana
                                                   [Cystopteris fragilis var. tenuifolia]
                                             Cystopteris regia
                                             Cystopteris sandwicensis
                                             Cystopteris sudetica
                                             Cystopteris tasmanica
                                             Cystopteris tennesseensis susp. utahensis
                                             Cystopteris tenuifolia
                                             Cystopteris tenuis
                                                   [Cystopteris fragilis var. mackayi]
                                                   [Cystopteris fragilis var. mackayii]
                                                   [Nephrodium tenue]
                                             Cystopteris utahensis
                                             Cystopteris viridula
                                             Cystopteris x illinoensis
                                             Cystopteris x wagneri
                                             Cystopteris × tennesseensis
                                                   [Cystopteris fragilis var. simulans]
                                                   [Cystopteris fragilis var. tennesseensis]
                                                   [Cystopteris tennesseensis]
                                     Filicula
                                     Gymnocarpium
                                             Gymnocarpium appalachianum
                                             Gymnocarpium disjunctum
                                                   [Dryopteris disjuncta]
                                             Gymnocarpium dryopteris
                                                   [Carpogymnia dryopteris]
                                                   [Dryopteris dryopteris]
                                                   [Dryopteris linnaeana]
                                                   [Lastrea dryopteris]
                                                   [Phegopteris dryopteris]
                                                   [Polypodium dryopteris]
                                                   [Thelypteris dryopteris]
                                               Gymnocarpium dryopteris subsp. disjunctum
                                               Gymnocarpium dryopteris var. disjunctum
                                               Gymnocarpium dryopteris var. pumilum
                                             Gymnocarpium fedtschenkoanum
                                             Gymnocarpium heterosporum
                                             Gymnocarpium jessoense
                                               Gymnocarpium jessoense subsp. parvulum
                                                     [Gymnocarpium continentale]
                                             Gymnocarpium oyamense
                                             Gymnocarpium remotepinnatum
                                             Gymnocarpium robertianum
                                                   [Lastrea robertiana]
                                                   [Polypodium calcareum]
                                                   [Thelypteris robertiana]
                                             Gymnocarpium x achriosporum
                                             Gymnocarpium x brittonianum
                                             Gymnocarpium x heterosporum
                                             Gymnocarpium x intermedium
                                             Gymnocarpium × brittonianum
                                                   [Gymnocarpium brittonianum]