Oak Wilt (Ceratocystis fagacearum); close-up view of fungal mat on peeled stem

Oak Wilt (Ceratocystis fagacearum); close-up view of fungal mat on peeled stem
Photographer: USDA Forest Service Archive, USDA Forest Service, Bugwood.orgRights holder: USDA Forest Service Archive, USDA Forest Service, Bugwood.org

From invasive.org