The specialized epidermal area of the roots from which the root hairs arise is termed the piliferous layer 根毛出现在根表皮的特化区域，称为根毛层。
2.
The outer tangential wall of no - nodules legume plants epidermal cells is thicker and darker than that of nodule legume plants 非结瘤豆科植物的根表皮细胞外切向壁的厚度比结瘤豆科植物的要厚，颜色也较深。
