This guide applies to the Chicago Region and is not complete for other regions. Disclaimer

Guide to Gyrodon

To date we only have Gyrodon merulioides recorded for the Chicago area. This species has an unusual association with scale insects on the roots of ash trees (Fraxinus).

Key to Species
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1a. Cap broadly convex to flat, may be irregular in outline, moderate to dark brown. Stem usually off-center. Pores yellowish, radially elongated, often with cross-veins. Found on the ground near ash trees. Gyrodon merulioides