单词protostele
n.: 【生】原生中柱网络: 原生中轴
【生物学】原生中柱
Actinostele A type 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。木质部是星形的,韧皮部位于星形之间。