Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["vegetable kingdom"]
           ["Cryptogams"]
             [Class Acrogens Lindl.]
               [Alliance Filicales Dumort.]
                 [Natural order Filices Juss. (1789)]
                   [Tribe "Peranemaceæ" C.Presl (1836), orth. inval.]