Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Superphylum †Psilophytanae Doweld (2001)
           Phylum †Psilophytophytaᵀ Zimmerm. (1930) [monotypic]
             Class †Psilophytopsidaᵀ Kidst. & Lang (1917) [monotypic]
               Order †Psilophytalesᵀ Pia (1924)
                 Family †Psilophytaceaeᵀ Hirmer (1927), nom. cons. prop.