Natura - nature actualia - actual entities Mundus Plinius - physical world naturalia - natural bodies ["Vegetabile Regnum" nom. inval. - plant kingdom] see Kingdom Plantae Haeckel (1866) ["Clandestinae"] [Class "Cryptogamia" L. (1735), nom. inval.] see Class Cryptogamia L. (1753) [Order "Filices" L. (1735), nom. inval.] see Order Filices L. (1753), nom. inval. [Genus "Pteris" nom. inval.] see Genus Pteris L. (1753)