There is another chemical in the shroom tree that helps kill pests. It is Lecithinase. Lecithinase is a chemical the helps the toxins penetrate cells in animals. The shroom tree has a relationship of commensalism with the Lorux , the Ells' Bells , and the Maytiss. The Maytiss, Lorux, and Ells' Bells all eat the shroom tree.
All animals can use the shroom tree for warmth because the shroom tree gives off heat.
The shroom tree evolved from the same plant that the poigeber evolved from. The shroom tree evolved from a small poisonous tree. The reason why it looks like it does today, is because this shape is very efficient for the circulatory system. The reason why the poigerber is not exactly the same as the shroom tree is because the poiger eventually split into two different circulatory systems which eventually caused the two to look differently.