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t-shirts nature t-shirts colored t-shirts compositae t-shirts exine t-shirts gamete t-shirts grain t-shirts horizontal t-shirts male t-shirts marigold t-shirts plant t-shirts pollen t-shirts reproduction t-shirts scanning electron micrograph t-shirts sculpted t-shirts sem t-shirts

photographs nature photos colored photos compositae photos exine photos gamete photos grain photos horizontal photos male photos marigold photos plant photos pollen photos reproduction photos scanning electron micrograph photos sculpted photos sem photos

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Marigold pollen grain. Colored scanning electron micrograph (SEM) of a pollen grain from a marigold plant (family Compositae). Pollen grains display a great variation in their size, shape and surface texture. The outer wall (exine) is highly sculpted in many plants, as seen here, which may assist in dispersal. The characteristic surface of a plant's pollen grains is used by botanists to recognize and classify species. Each pollen grain contains a male gamete (reproductive cell) that is intended to fertilize an egg or ovule (female gamete), and initiate the formation of a seed for a new plant. Magnification x1000 at 6x7cm size.