noun
- the simplest type of stele in vascular plants, consisting of a solid central core of xylem surrounded by phloem
Usage: botanical
Examples
- The protostele is found in the roots of most seed plants.
- Fern stems typically contain a protostele arrangement.
- The protostele represents the most primitive vascular organization.
- In cross-section, the protostele shows xylem in the center with phloem around it.
- Many fossil plants exhibit the protostele structure.
- The protostele lacks the complex arrangement seen in more advanced steles.