Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Plantae Haeckel (1866) - plants
                           Clade Rhodaria Cavalier-Smith 2021
                             Subkingdom Rhodoplantae G.W.Saunders & Hommers. (2004) [monotypic]
                               Phylum Rhodophyta Wettst. (1901) - red algae
                                 Subphylum Eurhodophytina G.W.Saunders & Hommers. (2004)
                                   Class Florideophyceae Cronquist (1960)
                                     Subclass Rhodymeniophycidae G.W.Saunders & Hommers. (2004)
                                       Order Ceramiales Oltmanns
                                         Family Ceramiaceaeᵀ Dumort. (1822)
                                           Genus Polysiphonia Grev. (1823)
                                             Polysiphonia elongata (Huds.) Sprengel
                                             Polysiphonia fucoides (Huds.) Grev. (1824)
                                             Polysiphonia harveyi J. Bailey
                                             Polysiphonia nigrescens (Huds.) Grev.
                                             Polysiphonia pacifica Hollenberg
                                             Polysiphonia urceolataᵀ (Dillwyn) Grev.
                                             Polysiphonia violacea (Roth) Sprengel