Title A contribution of the most important anatomical charcateristics of some mountain tree species of the Hyrcanian forests of north Iran along latitudinal and altitudinal gradient Type Presentation Keywords . Abstract . Researchers Rouhangiz Abbas Azimi (Fourth Researcher), Adel Jalili (Third Researcher), Seyedeh Maryam Sharafi (First Researcher), Alireza Naqinezhad (Second Researcher)