siphonostele
siphonostele One of 2 basic morphologies of stele, the other being protostele. Siphonosteles are the more highly developed form, being characterized by a cylinder of xylem and phloem surrounding a pith. Siphonosteles can be subdivided into amphiphloic siphonostele and ectophloic siphonostele. Compare DICTYOSTELE and MONOSTELE.
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siphonostele