The secondary thickening meristem originated from the parenchyma cells, which were located the outside of the atactostele.
次生加厚分生组织起源于正常的散生维管束中柱外侧的薄壁组织细胞。
2
It is a lateral meristem and contains fusiform initials giving rise to secondary xylem and phloem and ray initials giving rise to medullary rays. See also secondary growth.