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Eukaryota
  Fungi
    Dikarya
      Ascomycota
            Arthoniomycetes
                    Arthoniales
                            Opegraphaceae
                                     Combea
                                             Combea mollusca
                                     Opegrapha
                                             Opegrapha adpicta
                                             Opegrapha agelaea
                                             Opegrapha bacillosa
                                             Opegrapha capensis
                                             Opegrapha diagraphoides
                                             Opegrapha diaphorella
                                             Opegrapha diaphoriza
                                             Opegrapha exiguella
                                             Opegrapha interalbata
                                             Opegrapha lactifera
                                             Opegrapha lutulenta
                                             Opegrapha parvula
                                             Opegrapha prosodea
                                                   [Opegrapha prosodea var. microcarpella]
                                             Opegrapha semiatra
                                             Opegrapha signatella
                                             Opegrapha tapetica
                                             Opegrapha zanei
                                     Sclerophyton