Winter's bark pollen grain, SEM

Winter's bark pollen grain, SEM

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Caption: Scanning electron micrograph of winter's bark (Drimys winteri) pollen. The pollen is found in associations of 4 grains, known as tetrads. The grains are not pressed together closely in the tetrad. The outer wall (exine) of the grain comprises rod-like processes (bacula), fused at their tips, forming a network of ridges (muri) and surrounding a circular germinal pore. When the pollen, containing male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out of a pore, down the stigma, to the ovary. Male nuclei pass down the tube and fertilize the ovules to form seeds. Magnification: x3500 at 10x8 inch size.

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Keywords: black and white, botany, drimys winteri, monochrome, nature, plant, plants, pollen, pollen grain, reproduction, reproductive, scanning electron micrograph, sem, tetrad, type, winter's bark, winters bark

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