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A small, button-shaped, white fruiting body of Heterobasidion root disease, Heterobasidion annosum, with a penny placed nearby for size scale.

A small, button-shaped, white fruiting body of Heterobasidion root disease with a penny placed nearby for size scale.; Colorado Credit: Joseph Obrien, USDA Forest Service, Bugwood.org<br />Licensed under a <a href="https://creativecommons.org/licenses/by/3.0/us/">Creative Commons Attribution 3.0 License</a>
Credit: Joseph Obrien, USDA Forest Service, Bugwood.org
Licensed under a Creative Commons Attribution 3.0 License
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