Wood semi - ring - porous ; vessels solitary with angular outline ; perforation plates scalariform ; intervessel pits and vessel - ray pitting opposite or opposite to scalarifonn ; helical thickenings in vessel elements present 梯状穿孔板;管间纹孔式为互列;射线导管间纹孔式多对列,类似导管面间纹孔式。