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Eukaryota
  Chromista
    Heterokonta
      Ochrophyta
            Phaeophyceae
                    Laminariales
                            Alariaceae
                                     Alaria
                                             Alaria crassifolia
                                             Alaria esculenta
                                             Alaria marginata
                                                   [Alaria nana]
                                     Lessoniopsis
                                             Lessoniopsis litoralis
                                     Pterygophora
                                             Pterygophora californica
                                     Undaria
                                             Undaria pinnatifida
                                                   [Alaria pinnatifida]