Alder pollen grain, coloured scanning electron micrograph (SEM). The pollen grain of the alder plant (Alnus) is highly allergic. It is transported by the wind, and so is light with a smooth, non-sticky surface to aid its dispersal over distances of thousands of kilometres. Pollen grains are reproductive structures produced by the male parts of flowering plants.
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TOP07422234
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達志影像
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RM
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