Pine stem. Polarised light micrograph of a section through a single annual growth ring in the stem of a pine (Pinus sp.) tree,showing large thin-walled tracheid cells (yellow) of younger spring wood and smaller thick-walled tracheid cells (bright yellow) of older autumn wood. The large circular lacuna (resin duct,upper left) is lined with parenchyma cells. Magnification: x32 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 3417 px × 5125 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |