次生木质部由孔纹导管、 薄壁组织及射线所组成。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
轴向系统由筛胞、韧皮薄壁组织细胞、蛋白细胞和韧皮纤维组成，径向系统由韧皮射线组成。
In the axial systems, the phloem consists of sieve cells, phloem parenchyma cells, albuminous cell and phloem fibers. In the radial systems, it consists of phloem rays.
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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