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Morphology of ericoid mycorrhizae and dark septateendophytes (DSE) in hair roots of northern highbush blueberry (Vacciniumcorymbosum‘Bluecrop’) stained with methyl blue. (A) Intracellular hyphal coils (black arrows), (B) partial mantle on surface of epidermal cells (white arrows), (C) intracellular hyphal coils (black arrows) and DSE microsclerotia(white arrows), Scale bar = 12.5 μm.