Lichens on rock. Lichen is a symbiotic organism comprising an alga and a fungus. The fungus provides a buffer against harsh conditions for the alga,in return for carbohydrates,which the alga produces by photosynthesis. Lichens are often used as indicator species,as the health of their populations are linked to air pollution | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Cuthbert, Colin |
Taille de l’image : | 4651 px × 3787 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |