Elm stem (Ulmus procera) cross-section,polarised light micrograph. At centre is the pith (blue),outside of which is a ring of wood (brown/yellow),indicating that the stem is one year old. It contains xylem vessels (large holes),which transport water and minerals throughout the plant. The green/red ring is the cambium,and above this is a second woody ring (yellow) containing phloem vessels,which transport carbohydrates and hormones around the plant. The outermost layer is bark,consisting of cork. Magnification: x44 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 5189 px × 5408 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |