Camellia pollen grains. Coloured scanning electron micrograph (SEM) of pollen grains from a Camellia sp. flower. The grains have a highly sculpted outer wall (exine), which may assist in their dispersal. The characteristic surface of pollen grains is used by botanists to recognise and classify plants. Pollen grains are the male sex cells of a flowering plant.

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達志影像

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