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Organism
  Plantae
   Viridiplantae
     Streptophyta
        Charophyta
               [Charophytina]
               [Conjugophytina]
               [Mesostigmatophytina]
            Conjugatophyceae
                   [Conjugophyceae]
                   [Zygnematophyceae]
                    Desmidiales
                            Peniaceae
                                     Penium
                                             Penium costatum
                                             Penium cylindrus
                                               Penium cylindrus var. cylindrus
                                               Penium cylindrus var. subtruncatum
                                             Penium didymocarpum
                                             Penium exiguum
                                             Penium libellula
                                             Penium margaritaceum
                                               Penium margaritaceum var. elongatum
                                               Penium margaritaceum var. margaritaceum
                                             Penium minutum
                                             Penium oblongum
                                             Penium phymatosporum
                                             Penium polymorphum
                                             Penium rupestre
                                             Penium silvaenigrae
                                               Penium silvaenigrae var. parallelum
                                               Penium silvaenigrae var. silvaenigrae
                                             Penium spinospermum
                                             Penium spinulosum
                                                   [Pleurotaenium spinulosum]
                                             Penium spirostriolatum