Cortical bundle

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.

Because cacti live a long time, the cortical bundles have to function for many years. In every cactus species, the cortical bundles produce secondary phloems. In very old cortical bundles located at the base of very old shoots, the secondary phloem may attain a thickness of several millimeters.

External links

• http://www.cactus-art.biz/note-book/Dictionary/Dictionary_C/dictionary_cortex.htm
• http://aob.oxfordjournals.org/content/70/4/317.abstract
• http://www.sbs.utexas.edu/mauseth/weblab/webchap11stem/11.3-7.htm

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