The Calligraphy Peace Tree is a sacred tree of peacefulness. As long as it is undisturbed, there is peace in the land of the mermacorns. Specter the Mermacorn is the guardian of this tree, and she uses her magical mermacorn powers to keep it safe.
It has white bark, Japanese calligraphy all over it reading "Peace" and many lush, green leaves.
The Calligraphy Peace Tree is Treeman's ancestor. This must be why Treeman is so amazing.