Silver birch (Betula pendula) pollen grains, illustration. Pollen grains are reproductive structures produced by the male parts of flowering plants. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / NEMES LASZLO |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |