Pollen of Speedwell flower

Pollen of Speedwell flower

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Caption: False-colour scanning electron micrograph of a pollen grain of speedwell, Veronica filiformis. The grain is oval shaped. Its outer wall (exine) is streaked by a network of fine, elongated ridges (lirae) & grooves (striae) - an arrangement referred to as striate. There is a deep groove running down the centre of the grain, called a germinal furrow. When the pollen grain, containing the male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out of the furrow, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules & a seed is formed. Magnification: x560 at 35mm size.

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Keywords: botany, nature, plant, plants, pollen, reproduction, reproductive, speedwell, type, veronica, veronica filiformis

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