eustele

When a plant's vascular tissue develops in discrete bundles, it is said to have a eustele. See also protostele and siphonostele.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_8.html

eustele

(from the article `fern`) ...the original fern stem was protostelic (its stele having no pith or leaf gaps), but this is not necessarily true of the immediate ancestor of ...
Found on http://www.britannica.com/eb/a-z/e/54
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