Xenoxylon is a common wood from the Mesozoic of the Northern Hemisphere.Unfortunately,despite the large amount of data for Xenoxylon,its systematic position among conifers is still unclear (Marynowski et al.,2008).Xenoxylon species were reported from the Carnian (Late Triassic) to the Maastrichtian (Late Cretaceous) of the Northern Hemisphere (Philippe et al.,2013).Vogellehner (1968) and Philippe et al.(2013) divided Xenoxylon into three main anatomical groups: Xenoxylon latiporosum group,Xenoxylon phyllocladoides group,and Xenoxylon meisteri group.