living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Embryobionta Cronquist, Takht. & W.Zimm.
         Division Filicophyta see Phylum Pterophyta
           Subdivision Filicopsida Pfefferkorn (1976) see Class Filicopsida C.Agardh (1822)
             Order Filicales Dumort. (1829), nom. illeg. see Order Polypodiales Link (1833)
               Family Blechnaceae Newman (1844) - blechnoids
                 1 Genus Blechnum L. (1753)
                 2 Genus Salpichlaena J.Sm. (1841)
                 3 Genus Brainea J.Sm. (1856)
                 4 Genus Sadleria Kaulf. (1824)
                 5 Genus Doodia R.Br. (1810)
                 6 Genus Woodwardia Sm. (1793)