Reticulate venation is found in dicot leaves, while in monocot leaves venation is of parallel type. Biology being a science of exceptions, find out any exception to this generalisation.
Dicots having parallel venation, e.g., Corymbium, Calophyllum, Eryngium.
Monocot having reticulate venation, e.g., Smilax, Colocasia, Dioscorea.