DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Fern (Adiantum capillus-veneris) leaf. Light micrograph of a section through a number of sporangia from a maidenhair fern. Sporangia are the structures within which spores (orange) are produced. On ferns, they typically grow on the underside of the leaves (fronds). Magnification: x13 when printed 10 centimetres wide.
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