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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 4542 px × 3122 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |