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 "Algae" L. (1735), nom. inval.] see Order Algae L. (1753)
                 [Genus "Marsilea" nom. inval.] see Genus Marsilea L. (1753)