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Organism
  Plantae
   Thallophyta
      Rhodophyta
             [Rhodophyceae]
             [Rhodophycota]
             [Rhodophytina]
        Eurhodophytina
            Florideophyceae
                   [Florideophycidae]
                   [Florideophycideae]
              Rhodymeniophycidae
                    Gracilariales
                            Pterocladiophilaceae
                                     Holmsella
                                             Holmsella californica
                                             Holmsella pachyderma
                                                   [Choreocolax pachyderma]