Tracheary vessels in oak wood
Numéro d’image : 11536431
| False-colour scanning electron micrograph of a vertical section through oak heartwood,the wood (secondary xylem) of Quercus robur. The large,tubular structures are tracheary vessels which have become blocked by bladder-like ingrowths (yellow) known as tyloses. In young sapwood the vessels carry water & nutrients from the roots to the leaves,but after a few years they become blocked & no longer carry sap. The large vessels occur in early (spring) wood; the smaller tubes seen on the right of the photo are late-wood vessels. The compact tissue separating the two types of wood is the tree's ray system. Oak is a hardwood. Magnification: x12 at 6x4.5cm size | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
| Taille de l’image : | 3718 px × 4961 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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