Bracken leaves, SEM

Bracken leaves, SEM

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Credit: SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Caption: Bracken leaves. Coloured scanning electron micrograph (SEM) of the leaves of a bracken plant (Pteridium aquilinum). The undersides of the leaves are covered in spore-containing sacs known as sporangia (brown). The spores are released when the wall of a sporangium dries and splits to throw the spores away from the plant.

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Keywords: botany, coloured, fern, ferns, leaf, leaves, many, multiple, nature, plant, pteridium aquilinum, pteridophyte, pteridophytes, reproduction, reproductive, sac, sacs, scanning electron micrograph, sem, sporangia, sporangium, spore, spore-bearing, spores, underside, undersides

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