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 Bryophyta A.Braun (1864) - mosses and liverworts see Phylum Bryophyta A.Braun (1864)
           Class Hepaticopsida see Class Marchantiopsida Cronquist, Takht. & W.Zimm. (1966)
             Subclass Jungermanniidae Engl. (1893)
               Order Jungermanniales H. Klinggr.
                 Suborder Ptilidiinae see Order Ptilidiales Schljakov
                   Family Ptilidiaceae H. Klinggr.
                     Genus Ptilidium Nees (1833)
                       1 Ptilidium ciliare (L.) Nees
                       2 Ptilidium pulcherrimum (G. Web.) Hampe
                       3 Ptilidium californicum (Aust.) Underw.