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Eukaryota
  Fungi
    Dikarya
      Ascomycota
            Lecanoromycetes
                    Peltigerales
                            Massalongiaceae
                                     Massalongia
                                             Massalongia carnosa
                                     Polychidium
                                             Polychidium dendriscum
                                             Polychidium muscicola