STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Fern spore cases. Coloured scanning electron micrograph (SEM) of a sorus on the underside of a fern leaf. 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.
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