Holm oak (Quercus ilex) leaves and acorns (fruits). This tree is resistant to pollution,and is often grown in cities. Photographed in Rome,Italy,where samples from the tree's leaves have been used as indicators of air pollution levels | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Szoenyi, Michael |
Bildgröße: | 4430 px × 2953 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |