1. 
   protostele
   When a plant's vascular tissue develops in a solid central bundle, it is said to have a protostele. See also siphonostele and eustele.
   Found op http://www.ucmp.berkeley.edu/glossary/glossary_8.html
   
   
2. 
   protostele
   (from the article `vascular system`) The condition of the xylem, the woody elements in the stem, defines several categories. The protostele has a solid xylem core; the siphonostele has ... The vascular cylinder of a stem or root is called the stele. The simplest and apparently most primitive type of...
   Found op http://www.britannica.com/eb/a-z/p/124
   
   

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