Alder pollen. Macrophotograph of pollen falling from the male flowers (catkins) of the Italian alder tree,Alnus cordata,in a light wind. The alder catkins produce yellow,powdery pollen in vast quantities and release it onto the breeze. The wind then carries the pollen to fertilise female flowers. Wind-pollination is a haphazard process and so plants which rely on this form of fertilisation produce vast quantities of pollen. The resulting fine,airborne powder can trigger allergies,known as 'hay fever',in susceptible individuals. Magnification: x1. 5 at 35mm size | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Burgess, Dr. Jeremy |
Bildgröße: | 3100 px × 4521 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |