Elm stem. Light micrograph of a transverse section through the one-year-old woody stem of an elm (Ulmus procera) tree. The outer layer (epidermis,dark ring) is being sloughed (pushed/broken) off by developing underlying cork (red-brown),underneath which is the cortex made of collenchyma (orange-red). The lower cortex has bands of phloem fibres (red) and a layer of phloem sieve tubes (solid red with cavities). Under the phloem is a ring of cambium (light-red circle) and under this is a thick layer of wood (xylem,purple-red) with six vascular bundles. The solid pith (pink,centre) is composed of parenchyma cells. Magnification: x46 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 5362 px × 5241 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |