Stinging nettle stem. Polarised light micrograph of a transverse section through a stem of the stinging nettle plant (Urtica dioica). The layers from outer to centre (some very thin) are an epidermis (outer layer),collenchyma (light-blue),parenchyma (black with starch grains),phloem fibres (bright blue),phloem (dark yellow),cambium (violet),and xylem (yellow). There are medullary rays (black) in the xylem. The pith has broken down,leaving a central gap. Magnification: x5.5 when printed at 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4742 px × 4016 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |