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Pollen

Like water droplets and ice crystals, large amounts of pollen can produce coronae around light sources. The shape of the coronae depends on the shape of the pollen grains. Some pollens, for example that from birch, are perfectly spherical and give circular coronae difficult to distinguish, if the pollen clouds are not directly visible, from those of airborne droplets or ice crystals. Other pollens have pyramidal, elongated, pentagonal or even more exotic shapes. They all have in common that their size is uniform and that they occur in large amounts - the right conditions for corona formation.

Pollen grains alter their shape when they dry out and swell if they are exposed to a water-alcohol solution. They tend to dry out quickly, when exposed to the microscope illumination. They normally have little transparency.


Different kinds of pollen. Upper left: Tulip pollen in a water-alcohol solution. Upper right: Fresh salix pollen. Lower left: Hazel pollen in a water-alcohol solution. Lower right: Shrinking and fresh hazel pollen.

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