A stele consisting of a core of pith surrounded by concentric layers of xylem and phloem.
- In anatomical cross section, the stem of Lepidodendron displays an exarch siphonostele surrounded by secondary xylem in ranks.
- The node cross section of Equisetum looks quite different: the siphonostele is complete and leaf traces emerge from the solid vascular cylinder only at these locations.
- Use the three-dimensional diagram to understand how a leaf gap relates to the vascular cylinder of a siphonostele.
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