Alder pollen grain,coloured scanning electron micrograph (SEM). The pollen grain of the alder plant (Alnus) is highly allergic. It is transported by the wind,and so is light with a smooth,non-sticky surface to aid its dispersal over distances of thousands of kilometres. Pollen grains are reproductive structures produced by the male parts of flowering plants | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Oeggerli, Martin |
Taille de l’image : | 3626 px × 4835 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |