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

初木质的分，最早由形层形。

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

柱的一种类型。木质是星形的，韧皮位于星形之间。

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

在后韧皮和木质发育熟过程，这些细胞体积逐渐增，并液泡化，发育型薄壁细胞（芦荟素细胞），位于筛管外侧。