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  Plantae
      Charophyta
            Zygnematophyceae
                    Desmidiales
                            Desmidiaceae
                                     Cosmaridium
                                     Cosmarium
                                             Cosmarium conspersum
                                               Cosmarium conspersum var. latum
                                                     [Cosmarium anomalum]
                                             Cosmarium gerstenbergeri
                                             Cosmarium notabile
                                             Cosmarium parietale
                                                   [Cosmaridium silesiacum]
                                             Cosmarium parvulum
                                             Cosmarium subcrenatum
                                             Cosmarium subspeciosum
                                     Euastrum
                                             Euastrum everettense
                                     Micrasterias
                                     Staurastrum
                                             Staurastrum alternans
                                             Staurastrum hirsutum
                                               Staurastrum hirsutum var. muricatum
                                                     [Staurastrum muricatum]
                                     Tetmemorus
                                             Tetmemorus laevis