Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         ["Regnum Vegetabile" L. (1753), nom. inval. - plant kingdom] see Kingdom Plantae Haeckel (1866)
           [Class Cryptogamia L. (1753)]
             [Cryptophyta Link (1824)]
               [Order Algae L. (1753)]
                 [Genus Verrucaria Weber ex F.H. Wigg. (1780), nom. illeg.]
                   [Verrucaria leucocephala (Ehrh. ex Pers.) Ach. (1803)]