In root meristem it is also called periblem.

根部分组为皮层原。

Ground meristem The central region of the apical meristem from which the ground tissues of pith, cortex, medullary rays, and mesophyll differentiate. In root meristem it is also called periblem.

位于顶端分组的中部，髓、皮层、髓及叶肉这些基本组均是由基本分组分化而成。根部分组为皮层原。