Fern leaf, SEM

Fern leaf, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Fern leaf. Coloured scanning electron micrograph (SEM) of the underside of a fern leaf, showing sori. A sorus is a group of sporangia (brown) covered by an umbrella-shaped covering known as an indusium (pink). The sporangia contain spores, the reproductive units of the fern. Magnification: x4 when printed at 10 centimetres high.

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Keywords: biological, biology, botanical, botany, bottom, colored, coloured, false-colored, false-colour, false-coloured, fern, flora, indusium, leaf, nature, plant, reproduction, reproductive, scanning electron micrograph, scanning electron microscope, sem, sori, sorus, sporangia, sporangium, spore, spores, sporophyte, surface, underneath, underside

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