Another type of root is called the absorbing root. These are tiny root hairs that can exceed thousands of miles if the lengths were added together. Their function is to pull water and nutrients from the soil. Fungal growth like mushrooms on or near a tree trunk points to decay and rot. The presence of fungus is particularly serious if it is in profusion.
Problems develop when the anchoring roots rot and decay.
A gentle wind or mere rain water sitting on the leaves can cause the entire tree to topple without warning. The tree will appear healthy and fully clad with foliage because the tiny root hairs are still actively supplying the tree with nutrients. Call a professional certified arborist if you see profuse fungal growth. Ask for a root color exam. The exposed roots are then probed and tested to determine if rot or decay is present.