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Organism
  Bacteria
         [Microbe]
                    Desmidiales
                            Peniaceae
                                     Penium
                                             Penium margaritaceum
                                               Penium margaritaceum var. obesum
                                             Penium polymorphum
  Plantae
      Chlorophyta
             [Algae]
             [Macroalgae]
            Chlorophyceae
                    Desmidiales
                            Peniaceae
                                     Gonatozygon
                                     Penium