木质部

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

初生木质的成分，最早由原成层成。

Actinostele A rype of protostele in which the xylem is star shaped and the phloem lies between the points of the star.

原生中柱的一种类型。木质的，韧皮位于之间。

These cells began to devise, then developed into aloin cells through enlargement of volume and vacuolization with the differentiation of metaphloem and metaxylem.

在后生韧皮和木质发育成熟过程中，这些细胞渐增大，并液泡化，发育成为大型薄壁细胞（芦荟素细胞），位于筛管外侧。