Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["vegetable kingdom"]
           ["Cryptogams"]
             [Class Acrogens Lindl.]
               [Alliance Filicales Dumort.]
                 [Order Polypodiaceae J.Presl & C.Presl] see Order Filices L. (1753), nom. inval.