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Organism
  Plantae
      Tracheophyta
             [Equisetophyta]
             [Pteridophyta]
        Polypodiophytina
            Polypodiopsida
                   [Cyatheopsida]
                   [Equisetopsida]
                   [Filicopsida]
                   [Gleicheniopsida]
                   [Hymenophyllopsida]
                   [Marattiopsida]
                   [Marsileopsida]
                   [Matoniopsida]
                   [Osmundopsida]
                   [Psilotopsida]
                   [Pteridopsida]
                   [Salviniopsida]
                   [Sphenopsida]
              Polypodiidae
                     [Dennstaedtiidae]
                     [Marsileidae]
                     [Plagiogyriidae]
                     [Pterididae]
                    Cyatheales
                           [Dicksoniales]
                           [Hymenophyllopsidales]
                           [Loxsomatales]
                           [Metaxyales]
                           [Plagiogyriales]
                            Metaxyaceae
                                     Metaxya
                                           [Amphidesmium]
                                             Metaxya contamanensis
                                             Metaxya elongata
                                             Metaxya lanosa
                                             Metaxya parkeri
                                                   [Polypodium parkeri]
                                             Metaxya rostrata
                                                   [Alsophila blechnoides]
                                                   [Alsophila rostrata]
                                                   [Amphidesmium blechnoides]
                                                   [Amphidesmium parkeri]
                                                   [Amphidesmium rostratum]
                                                   [Aspidium rostratum]
                                                   [Cyathea blechnoides]
                                                   [Polypodium blechnoides]
                                                   [Polypodium humboldtii]
                                                   [Polypodium rostratum]
                                             Metaxya scalaris