The structure of the root apex of Pyrus betulaefolia Bunge consists of the stelar meristem,cortical cells and the root cap.

杜梨根端的结构,可分成中柱分生组织,皮层细胞和根冠。

In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap.

然而在根中，它还是适用的。在一些被子植物的根中，还发现了第四种组织原，即calpytrogen，与根冠发生有关。