形成层

Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.

束间是位于茎维管束间具有旺盛分裂能力一细胞。

Acropetal differentiation of the cambium layer continues as the primary root elongates.

向顶分化像初生根伸长一样在继续进行。

In roots it may also be called plerome.

在根中也被可称为中柱。

Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first.

初生木质分，最早由。

Bark The outermost tissue of the stem and roots in woody plants, on the outside of the phellogen (cork cambium).

木本植物中茎或根中木栓外方全组织，称为树皮。