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wood prints nature wood prints allergen wood prints allergy wood prints ambrosia wood prints ambrosia artemisiifolia wood prints asteraceae wood prints biology wood prints botany wood prints colorized wood prints common ragweed wood prints compositae wood prints dust wood prints exine wood prints gamete wood prints gametes wood prints

photographs nature photos allergen photos allergy photos ambrosia photos ambrosia artemisiifolia photos asteraceae photos biology photos botany photos colorized photos common ragweed photos compositae photos dust photos exine photos gamete photos gametes photos

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Color enhanced scanning electron micrograph (SEM) of pollen grains from the common ragweed (Ambrosia artemisiifolia). The grains have a spiked outer wall (exine), which may assist in their dispersal by improving their adherence to pollinating insects. The characteristic surface of pollen grains is used by botanists to recognise and classify plants. Each pollen grain contains a male gamete (reproductive cell) that is intended to fertilise an egg or ovule (female gamete), and initiate the formation of a seed for a new plant. These pollen grains are an allergen that may cause hay fever in susceptible individuals. Magnification x1000 when printed at 10 cm wide.