Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["Vegetabile Regnum" nom. inval. - plant kingdom] see Kingdom Plantae Haeckel (1866)
           ["Clandestinae"]
             [Class "Cryptogamia" L. (1735), nom. inval.] see Class Cryptogamia L. (1753)
               [Order "Filices" L. (1735), nom. inval.] see Order Filices L. (1753), nom. inval.
                 [Genus "Ophioglossum" Tourn., nom. inval.] see Genus Ophioglossum L. (1753)