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wood prints nature wood prints pattern wood prints botany wood prints colored wood prints exine wood prints flowering plant wood prints gamete wood prints male wood prints passiflora cerulea wood prints passion flower wood prints plant wood prints plants wood prints pollen grain wood prints reproduction wood prints reproductive wood prints

photographs nature photos pattern photos botany photos colored photos exine photos flowering plant photos gamete photos male photos passiflora cerulea photos passion flower photos plant photos plants photos pollen grain photos reproduction photos reproductive photos

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Passion flower pollen. Colored scanning electron micrograph (SEM) of a pollen grain of the passion flower (Passiflora cerulea). This spherical pollen grain resembles a tennis ball, with three germinal furrows dividing a highly-sculpted outer wall (exine). When a pollen grain, containing the male gametes, lands on the stigma of another passion flower, it germinates. A pollen tube grows out of one of the germinal furrows, growing down the stigma and into the ovary. The male gametes pass down the tube into the ovary where one fuses with an ovule (egg cell) to form a seed. Magnification x2860 when printed 10cm wide.