Tree Bark Fungus Identification Guide

Is that grand tree sitting just next to the house a menace? Fungus on a tree might indicate that it is. It is important that homeowners, arborists, and landscapers recognize the signs when a particular tree may present a hazard. There are different types of fungi on trees, so tree fungus identification is the first step.

Fungus is used as a synonym for mushrooms, but mushrooms are actually the fruiting structures of the fungi. Most gardeners have observed mushrooms growing on trees. Is this dangerous? It can be, especially when it is widespread.

If your tree has fungal fruiting structures on several limbs, you will want to consider removing the tree if it’s in a location where property damage may occur or where people or pets could be struck by falling limbs or the falling tree.

If most of the tree appears healthy, any single branches with fungal fruiting structures should be removed promptly, regardless of the identity of the fungus present.

Some people know about wild mushrooms and the extremely critical nature of correct fungus identification. Identifying tree fungus is critical, as well. While some fungi grow on trees without damaging them, several tree fungal types can cause destructive decay in tree trunks and limbs. In fact, under conditions that favor fungus growth, fungi can decay extensive portions of the wood of a tree in months. The destructive fungus can cause heart rot, sap rot, or canker rot. These can undercut the strength of the wood as well as destroy storage and conductive tissues in the sapwood.

It’s easiest to talk about different species of fungus by genus.