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Organism
  Plantae
   Viridiplantae
     Streptophyta
     Embryophyta
      Tracheophyta
        Polypodiophytina
            Polypodiopsida
                   [Arthropsida]
                   [Equisetopsida]
                   [Eusporangiopsida]
                   [Filicopsida]
                   [Marattiopsida]
                   [Psilopsida]
                   [Psilotopsida]
              Polypodiidae
                     [Dennstaedtiidae]
                     [Leptosporangiopsida]
                     [Marsileidae]
                     [Plagiogyriidae]
                     [Pterididae]
                    Polypodiales
                           [Aspleniales]
                           [Athyriales]
                           [Blechnales]
                           [Dennstaedtiales]
                           [Dryopteridales]
                           [Filicales]
                           [Lindsaeales]
                           [Negripteridales]
                           [Parkeriales]
                           [Platyzomatales]
                           [Pteridales]
                           [Thelypteridales]
                            Sphenophyllaceae
                                     Sphenophyllum