Calyptogen a layer of meristematic cells covering the root apical meristem in some plants (e. g. grasses) that gives rise to and maintains the root cap.

根冠原：在一些植物中覆盖根顶端分生组织的一层具有分生能力的细胞，根冠原可以产生和维持根冠。

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Root border cells, previously referred as sloughed root cap cell, is a special cell population, which separates in large number from the periphery of the root cap and accumulates in the root tip.

根边缘细胞是由根冠游离并大量积累在根尖上的一群细胞，具有保护根尖免受生物和非生物的胁迫的作用。

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