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Protostele

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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.
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The anatomy was simple, the central strand of sclerenchyma of the algal progenitors becoming a strand of tracheids forming the earliest type of stele, the protostele.
The telome theory by Wilson, Carl L. / The Botanical Review
It is doubtful whether the terminology used to describe the Matteuccia apex would be as appropriate in analyzing structurally similar shoot apices of ferns with protosteles or ferns with highly dissected or polycyclic steles.
Anatomy and development of the fern sporophyte by White, Richard A.; Turner, Melvin D. / The Botanical Review
 
 
 
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