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  Plantae
    Tracheobionta
      Pteridophyta
            Polypodiopsida
                    Osmundales
                            Osmundaceae
                                     Leptopteris
                                             Leptopteris hymenophylloides
                                     Osmunda
                                             Osmunda cicutaria
                                             Osmunda cinnamomea
                                             Osmunda claytoniana
                                             Osmunda flexuosa
                                             Osmunda humilis
                                             Osmunda oblongifolia
                                             Osmunda palustris
                                             Osmunda phyllitidis
                                             Osmunda regalis
                                               Osmunda regalis subsp. palustris
                                               Osmunda regalis var. brasiliensis
                                               Osmunda regalis var. spectabilis
                                             Osmunda virginiana
                                     Osmundastrum
                                             Osmundastrum cinnamomeum
                                     Todea
                                             Todea barbara