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The location and sample layout for each (2.5 ha) of the four research sites in the Allegheny National Forest, Pennsylvania, USA: site 1 (41.43704, −78.79137); site 2 (41.45674, −78.80247); site 3 (41.47875, −78.77288); site 4 (41.485216, −78.741848). Field surveys were conducted in 2021 and 2022. Yellow dots in each map indicate sample points where a measurement of F. alnus was taken, and white lines indicate unpaved forest roads.
