Water fern (Azolla filiculoides) covering the surface of a pond. This aquatic fern forms a symbiotic relationship with a cyanobacterium,enabling it to fix nitrogen from the air | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Fleming, Vaughan |
Taille de l’image : | 3680 px × 4860 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |