VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY
White trunk rot fungus (Phellinus igniarius) fruiting body, on the trunk of a tree. This hard, hoof-shaped fruiting body (known as a "conk") holds the spores and is produced during reproduction. The white trunk rot fungus is a serious pathogen of hardwood trees, entering through branch stubs and feeding on living wood. The interior of the trunk becomes soft as it decays and the tree may die as a result.
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