Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Lycopodiobiotina Doweld (2001)
     Division Lycopodiophyta D.H.Scott (1900) see Phylum Lycopodiophyta D.H.Scott (1900)
       Class Isoëtopsida Rolle (1884)
         Order Isoëtales Prantl (1874)
           Family †Nathorstianaceae Němejc [monotypic]
             Genus †Nathorstiana P.B.Richt. (1909)