Lichen. Unidentified lichen growing on a rock. A lichen is a mutualistic organism comprising an alga and a fungus that live in a mutually- beneficial relationship. The alga produces carbohydrates for the fungus by photosynthesis,and the fungus protects the alga from harsh conditions. Lichens are highly sensitive to pollution: several are used as indicator species for sulphur dioxide levels in the atmosphere | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Fraser, Simon |
Bildgröße: | 3992 px × 4961 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |