Central Taxonomic Thesaurus
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  Bacteria
      Cyanobacteria
            Cyanophyceae
                    Nostocales
                            Nostocaceae
                                     Anabaena
                                             Anabaena azollae
                                             Anabaena flos-aquae
                                             Anabaena inaequalis
                                             Anabaena oscillarioides
                                             Anabaena pseudoscillatoria
                                             Anabaena sphaerica
                                             Anabaena torulosa
                                             Anabaena variabilis
                                     Aphanizomenon
                                             Aphanizomenon flos-aquae
                                     Cylindrospermum
                                             Cylindrospermum catenatum
                                             Cylindrospermum licheniforme
                                             Cylindrospermum muscicola
                                     Nodularia
                                             Nodularia harveyana
                                             Nodularia spumigena
                                     Nostoc
                                             Nostoc commune
                                             Nostoc ellipsosporum
                                             Nostoc muscorum
                                             Nostoc piscinale
                                             Nostoc pruniforme
                                             Nostoc sphaeroides
                                             Nostoc verrucosum
                                     Trichormus
                                             Trichormus azollae
                                             Trichormus variabilis