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.
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。
Companion cells arrange in a row or single cell as long as the sieve tube member.
伴胞为与筛管分子等长的一列或单个细胞。
Companion cells arrange in a row or single cell as long as the sieve tube member.
伴胞为与筛管分子等长的一列或单个细胞。
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