出典:Wikipedia
出典:『Wikipedia』 (2011/03/19 20:47 UTC 版)
The transport of water and nutrients through the voluminous cortex of the cactus is possible because of the presence of a vascular system exclusive to cacti, the cortical bundle. The cortical bundle emerges radially from the xylem and produces shoots that run tangentially to the cortex, branching extensively and vascularizing every part of the cortex.