Trifolium pratense

 

This micrograph shows a detail of part of the stem, and two adjacent vascular bundles.

The epidermis (EP) is thin-walled and beneath this are four-five rows of chlorenchyma. The cortex is separated from the stele by a starch sheath (SS) and immediately beneath this, are very conspicuous phloem fibre caps (PF), which overlie a narrow band of predominantly primary phloem (P). A fascicular cambium zone (CZ) has produced a few secondary xylem elements, but apparently, no secondary phloem (inset, below right). The stele (St) is entirely parenchymatous.