Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["vegetable kingdom"]
           ["Cryptogams"]
             [Class Acrogens Lindl.]
               [Alliance Muscales Lindl.]
                 [Hepaticæ Juss. (1789)]
                   1 [Natural order Ricciaceae Rchb. (1828)]
                   2 [Natural order Marchantiaceae Cord.]
                   3 [Natural order Jungermanniaceae Lindl.]