Fungals are forests of the Underdark. Some of these places can be as rich in vegetation and life as their surface counterparts. Vegetaion of fungal forests is nothing like the plants and trees found under the rays of Merioss and Juniger. Fungals comprise innumerable varieties of small to colossal mushrooms, stalks, vines, and numerous other plant and tree-like growths that are strange and exotic to outsiders. In many of these Underdark forests, you will find light coming from phosphorescent fungi and other organisms. In these areas of dense, yet not too bright light, things will grow that cannot be found in non-illuminated areas of the Underdark. Large populations of the Underark are built near fungals or create their own from planting and cultivating for without them they would not be able to sustain their populations.