Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Bacillariobiota Doweld (2001)
       Subkingdom Bacillariobiotina Doweld (2001)
         Phylum Fucophyta Pax (1904) see Phylum Phaeophyta Kjellman (1891)
           1 Class Dictyotophyceae Engl. (1892)
           2 Class Fucophyceae Warming (1884) see Class Phaeophyceae Hansgirg (1886)