Domain Eucaryota
   Subdomain Chlorota Doweld (2001)
     Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
       Subkingdom Pteridobiotina Britton & A. Br. (1896)
         Superphylum Cycadophytanae Doweld (2001)
           01['X'] Phylum †Noeggerathiophyta Zimmerm. (1959) [monotypic]
           02['XI'] Phylum †Aneurophytophyta Bold (1973) see Subphylum Aneurophytophytina Doweld (2001)
           03['XII'] Phylum †Moresnetiophyta Doweld (2001) see Division Pteridospermatophyta Meyen
           04['XIII'] Phylum †Lyginopteridophyta Doweld (2001) [monotypic] see Division Pteridospermatophyta Meyen
           05['XIV'] Phylum Cycadophyta Bessey (1907) see Subclass Cycadidae Pax (1894)
           06['XV'] Phylum †Peltaspermophyta Doweld (2001) see Division Pteridospermatophyta Meyen
           07['XVI'] Phylum †Cycadeoideophyta T.N.Taylor (1981) [monotypic] see Class Cycadeoideopsida D.H.Scott (1923)
           08['XVII'] Phylum Gnetophyta Bessey (1907) see Subclass Gnetidae Pax (1894)
           09['XVIII'] Phylum Pinophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Class Pinopsida Burnett (1835)
           10['XIX'] Phylum Magnoliophyta Cronquist, Takht. & Zimmerm. ex Reveal (1996) see Infraphylum Angiospermae auct.