UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
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This fungus is commonly called a “shelf fungus.” The main body of the fungus is inside the tree slowly digesting (rotting) the heartwood. The fungus will not kill the tree, but over time can cause a substantial decay of the heartwood, which results in a structural weakening of the tree. The internal decay of the wood will make the tree more susceptible to breakage during wind storms and may cause the tree to fall over or break for no apparent reason.