| The way in which vascular tissue is organized in the stem is called a stele. A key to the diagram below is: black = xylem; white = phloem; stippled = pith or cortex. Haplosteles have no pith. Siphonosteles have a pith that does communicate or connect to the cortex on the outside of the stele. A dictyostele is a broken siphonostele (it is broken because of leaf gaps). The eustele is the type characteristic of most of the seed-bearing plants. The atactostele is characteristic of the monocot flowing plants. |
