Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["vegetable kingdom"]
           ["Cryptogams"]
             [Class Acrogens Lindl.]
               [Alliance Muscales Lindl.]
                 [Natural order Musciᵀ Hedw. (1801)]
                   [Group Pleurocarpi Brid..]