Young pine tree stem. Light micrograph of a transverse section through a one-year-old primary stem of a pine tree (Pinus sp.). The cells of the outer epidermis (bright red) are thick-walled and covered with a thick layer of cuticle to stop water loss. Beginning to form underneath the epidermis is the cork cambium (phellogen) which has produced 2-3 layers of cork (orange-brown),to resist forest fires. The vascular cylinder (centre) consists of a thin layer of phloem (pale blue). The first year xylem (red) consists of tracheids and embedded in the xylem are scattered resin canals. Magnification: x14 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4835 px × 5846 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |