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Mean relative abundance of the 75 ectomycorrhizal species in the A1 horizon (a) or in the A2 horizon (b). Species are ranked according to their mean frequencies. An asterisk indicates an ectomycorrhizal species present in only one of the two horizons. Twenty-seven species were observed only in the A1 horizon and ten only in the A2 horizon. Thirty-eight species were present in both horizons.
