Transfer cells were widely distributed in cotyledon tissue this period which a lot of substance accumulation.Transfer cells occur first in final and edgeways of vascular bundle.

• 子叶组织中传递细胞在物质积累盛期也分布广泛，传递细胞首先发生于维管束的末端和边缘，其细胞壁内突，显极性生长。