Siphonostele

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siphonostele

[sī′fän·ə‚stēl]
(botany)
A type of stele consisting of pith surrounded by xylem and phloem.

Siphonostele

 

in fern stems, a type of central cylinder in which the conducting tissues (xylem and phloem) surround the pith parenchyma. [23–1436–]