Protostele


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Related to Protostele: eustele, siphonostele

protostele

[′prōd·ə‚stēl]
(astronomy)
A stele consisting of a solid rod of xylem surrounded by phloem

Protostele

 

a primitive type of central cylinder, or stele, in plants. The protostele consists of xylem and phloem but has no pith or medullary rays.