Lime tree stem. Light micrograph of a section through the stem of a lime tree (Tilia europaea). The outer epidermis has been shed and replaced by a layer of cork (dark red). Under the cork is the outer cortex layer of flexible collenchyma tissue (dark blue and red) and a lower cortex of parenchyma (blue). Next is a ring of phloem (blue) with large sieve tubes,companion cells and fibres (pink). The phloem is broken by primary medullary rays (blue,triangular) and thin subsidiary medullary rays (dark blue). Next is a ring of xylem (light pink) with large files of vessels and small woody parenchyma (dark red-brown). There are two yearly growth rings,which have large vessels laid down in the spring and small vessels in the previous autumn. Magnification: | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 3370 px × 5203 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |