a simple type of stele with a central core of xylem surrounded by a cylinder of phloem: occurs in most roots and the stems of ferns, etc
Derived Forms
protostelic, adjective
protostele in Science
protostele
(prō'tə-stēl', prō'tə-stē'lē) The most primitive form of stele, consisting of a solid core of xylem encased by phloem or of xylem interspersed with phloem. The roots of all vascular plants, as well as the stems of lycophytes, have protosteles.