Tracheary vessels in oak wood
Bildnummer 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 | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / Burgess, Dr. Jeremy |
| Bildgröße: | 3718 px × 4961 px |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Restrictions: | - |
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