Surface of a water fern (Azolla sp.),coloured scanning electron micrograph (SEM). The leaves of water ferns support colonies of Anabaena azollae,a blue-green alga that fixes atmospheric nitrogen and enriches the water in which it grows. For this nitrogen-fixing ability,water ferns are grown in rice paddies in India as a fertiliser plant. The roots are unanchored and are generated by multiple divisions in various planes from just one apical cell | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Oeggerli, Martin |
Taille de l’image : | 5002 px × 3495 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |