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protostele

A *stele consisting of a cylinder of phloem and pericycle surrounding a central core of xylem and lacking a central pith. This type of stele is regarded as being the most primitive both ontogenetically and phylogenetically. The *haplostele , *actinostele , *plectostele , and *medullated protostele are all forms of protostele. Compare siphonostele.

 
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