形成层

In roots it may also be called plerome.

原形成在根中也被可称为中柱原。

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

生木质部的成分，最早由原形成形成。

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

形成的向顶分生根伸长一样在续进行。

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

束间形成于茎的维管束间的具有旺盛分裂能力的一细胞。

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

木本植物中的茎或根中木栓形成外方的全部组织，称为树皮。