Multiple lichen species growing on a rock in unpolluted air. Lichens are formed from the a symbiotic association between a fungus and an alga. The alga is contained within the hyphae (filaments) of the fungus. Lichens are slow-growing,and are usually found on stones and the bark of trees. They are sensitive to pollution,and are a good indicator of air quality. Photographed in Snowdonia National Park,North Wales,UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Molloy, Cordelia |
Bildgröße: | 4827 px × 3620 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |