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White Crust on Exposed Tree Roots: Benign Fungus

A hard, white, rubbery crust on exposed roots is likely a soil fungus. If the root is dead, it's a saprophytic fungus decomposing it; if alive, it's a symbiotic mycorrhizal fungus aiding nutrient uptake. Neither is serious. Keep trees healthy and they'll coexist with fungal partners.

Fungus on tree root

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