Rose stem. Light micrograph of a cross-section through the stem of a rose (Rosa sp.). The three triangular protrusions are thorns,which protect the plant from being eaten by animals. Each thorn is comprised of the outer epidermis,with a waxy outer cuticle (yellow),a woody layer (brown) and an inner mass of dense parenchyma (pink). The stem is composed of epidermis,bands of parenchyma and chlorenchyma,cortex,vascular bundles - consisting of outer fibres (yellow),phloem (red),cambium (pink) and xylem (brown and pink) - and then the central pith (white). Magnification: x14 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4791 px × 5906 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |