轴向系统由管胞和木薄壁组织细胞组成；
Axial and radial systems formed the secondary xylem of the roots.
木薄壁组织为弥漫型，或在较老的木质部中部分为傍管型；
Organization of wooden thin wall is diffuse model, or be in charge of to draw near partly in older xylem model;
油松茎端的皮层薄壁组织和幼茎木薄壁组织中具含树脂细胞分布。
Some resin containing cells are present in parenchym of cortex in shoot apex and xylem parenchym of stem in Pinus tabulaeformis .
弦切面上木射线与轴向薄壁组织形状、大小均不相同；
The shape and size of wood ray is different form that of longitudinal parenchyma;
弦切面上木射线与轴向薄壁组织形状、大小均不相同；
The shape and size of wood ray is different form that of longitudinal parenchyma;
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