Pollen from the Great Reedmace

Pollen from the Great Reedmace

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Credit: R.E.LITCHFIELD/SCIENCE PHOTO LIBRARY

Caption: False colour scanning electron micrograph of pollen from the Great Reedmace, Typha latifolia. The pollen is always found in groups of 4 grains, called tetrads, in a square or rhomboid arrangement. Each grain is about 18 micrometres across with an outer wall consisting of a lacey network of ridges. Thin sutures connect the 4 grains together. Germinal pores are visible in each grain. When the pollen, contaning the male gametes, lands on the stigma of the flower, it germinates. A pollen tube grows out of the germinal pore, down through the stigma to the ovary. The male nuclei pass down this tube, fertilize the ovules & a seed is formed.

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Keywords: botany, great reedmace, nature, plant, plants, pollen, reproduction, reproductive, scanning electron micrograph, sem, tetrad, type, typha, typha latifolia

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