Mushrooms at Maple Tree Base: Harmless or Hazard?

Large mushrooms and fungi appear on surface roots of two maples. Are they harmful to trees, pets, or humans?

Interpretation

Many fungi are saprophytic (decomposing dead organic matter) and not pathogenic. However, some indicate internal wood decay. If trees appear healthy, mushrooms are likely benign.

Precautions

• Remove mushrooms to prevent pet/child ingestion (some are toxic).
• Do not consume wild mushrooms.
• If trees show decline (dieback, leaning), consult an arborist.

Identification Resources

• UC IPM wood decay fungi guide
• Local county extension office (find at extension.osu.edu)

Collect samples and photos for expert ID.