“Examples of map symbols used to show trees and forests on old Russian maps (1700s & 1800s) are documented in Izobrazhenie Lesa Na Kartakh by Liudmila Andreevna Shaposhnikova. The title is roughly translated to “How Forests are Depicted on Maps.” The book was published in Moskva, former USSR, in 1957.”

— more here

via Orla Joan