Microscopical and mycological investigations on wood of pendunculate oak (Quercus robur L.) relative to the occurrence of oak decline

arbre champignon drought stress eiche enfermedades vasculares estres faisceau vasculaire forest dieback fungi haces vasculares hongos maladie vasculaire marchitez del bosque micelio mycelium quercus robur stress trees vascular bundles vascular diseases wasserstress