I have been thinking of making a font for Map Symbols for Trees, starting from symbols already in use and devising some new symbols for various types of tree.
I found the following web page that includes some Japanese Map Symbols for trees.
http://www.clker.com/clipart-24705.html
There are designs for Coniferous Trees, Palm Trees and Broadleaf Trees.
The following page includes a few more symbols relating to trees.
http://en.wikipedia.org/wiki/Japanese_map_symbols
William Overington
1 April 2009