Lichen (Usnea subfloridana) growing on a branch of a fir tree. This lichen is a good indicator of air quality,as it is intolerant of high sulphur dioxide concentrations. A lichen is a symbiotic organism comprising a fungus and an alga. The alga produces nutrients for the fungus by photosynthesis. Photographed in western Scotland | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 4542 px × 3122 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |