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Longitudinal semithin sections of the phelloderm of asymptomatic (A, C, E, G, I) and black dot symptomatic (B, D, F, H, J) regions of the field-grown potato cultivars Lady Felicia (A, B), Lady Christl (C, D), Cheyenne (E, F), Gwenne (G, H), and Erika (I, J). Bars correspond to 50 µm. f: fungal structures.
