Passion flower pollen grain, SEM

Item # 1139783

Steve Gschmeissner

<p>Passion flower pollen. Coloured 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.</p>

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Science Botany Steve Gschmeissner