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Prokaryota
  Bacteria
      Cyanobacteriophyta
            Cyanophyceae
                    Nostocales
                            Nostocaceae
                                     Desmonostoc
                                             Desmonostoc muscorum
                                                   [Nostoc muscorum]
                                     Hormothamnion
                                     Nostoc
                                             Nostoc caeruleum
                                             Nostoc commune
                                             Nostoc paludosum
                                             Nostoc pruniforme
                                             Nostoc sphaericum
                                             Nostoc verrucosum
                                     Sphaerozyga