Willow pollen grain,coloured scanning electron micrograph (SEM). Pollen grains,containing the male sex cells (gametes),are reproductive structures produced by the male parts of flowering plants. The structure shown is the hard outer casing (exine) that protects the gametes during transit between flowers. Magnification: x4150 when printed at 10 centimetres across | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Hughes, Louise |
Taille de l’image : | 4134 px × 2158 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |