Beech Leaf Colonization by the Endophyte Apiognomonia errabunda Dramatically Depends on Light Exposure and Climatic Conditions - Bahnweg, G; Heller, W; Stich, S; Knappe, C; Betz, G; Heerdt, C; Kehr, R D; Ernst, D; Langebartels, C; Nunn, A J; Rothenburger, J; Schubert, R; Wallis, P; Müller-Starck, G; Werner, H; Matyssek, R; Sandermann Jr , H (Plant Biology, 2005)