HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Lily of the valley rhizome. Light micrograph of a section through a lily of the valley (Convallaria majalis) rhizome. At left is the stele, the centre of the rhizome It contains vascular bundles (red and blue) surrounded by parenchyma cells. The vascular bundles consist of xylem vessels (red), which transport water and nutrients around the plant, and phloem vessels (blue), which transport carbohydrates and plant hormones. Between the outer cortex (right) and stele is the endodermis (orange). A rhizome is an underground stem that can produce new plants through vegetative (asexual) reproduction. Magnification: x40 when printed at 10 centimetres wide.
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