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Organism
  Fungi
            Pucciniomycetes
                    Pucciniales
                            Melampsoraceae
                                     Melampsora
                                             Melampsora bigelowii
                                             Melampsora humboldtiana
                                             Melampsora medusae
                                             Melampsora populnea
                                                   [Melampsora tremulae]