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ECM roots of silver birch. Cross-sections (5-10 μm) of silver birch clone A (A) and PtCOMT lines 23 (B), 44 (C) and 65 (D) roots after 8 weeks of co-cultivation with P. involutus. Arrow, Hartig net; triangle, mycelium of P. involutus; e, epidermal cell of silver birch root. Bars = 20 μm.
