Morphology of Melanconiella corylina from Corylus mandshurica. A habit of acervuli on branches B–F process of development of acervulus G transverse section through acervulus H–I longitudinal section through acervulus J conidiophores K conidiogenous cells and conidia L–W conidia. Scale bars: 2 mm (A), 500 μm (B–I), 10 μm (J–K), 5 μm (L–W).