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Organism
  Plantae
   Viridiplantae
     Streptophyta
     Embryophyta
      Marchantiophyta
             [Hepaticae]
             [Hepatophyta]
             [Marchantiophytina]
            Marchantiopsida
                   [Hepaticopsida]
                   [Hepatopsida]
              Marchantiidae
                     [Marchantiae]
                     [Sphaerocarpidae]
                    Sphaerocarpales
                           [Riellineae]
                           [Sphaerocarpineae]
                            Riellaceae
                                   [Reillaceae]
                                     Riella
                                             Riella affinis
                                             Riella americana