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Eukaryota
  Plantae
    Embryophyta
      Marchantiophyta
            Marchantiopsida
                    Sphaerocarpales
                            Riellaceae
                                     Riella
                                             Riella affinis
                                             Riella alatospora
                                             Riella americana
                                             Riella capensis
                                             Riella echinospora
                                             Riella purpureospora