nature printing

from The Century Dictionary.

• noun A process invented by Alois Auer, in Vienna, Austria, in 1853, by which objects, such as plants, mosses, ferns, lace, etc., are impressed on a metal plate so as to engrave themselves, copies or casts being then taken for printing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A printing process that produces an impression of plants, animals, rocks, or other natural subjects.