Anatomical response of two Olmus minor progenies to Ophiostoma novo-ulmi:: is xlem anatomy a key factor in disease tolerance? - Martín García, Juan Antonio; GIL SANCHEZ, LUIS ALFONSO (Iufro Working Party 7.02.01 Root And Stem Rots & Life + Elmias Ash And Elm Conference Iufro-Life, 2018)