DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Fern (Adiantum capillus-veneris) leaf. Light micrograph of a section through a leaf (thin) from a maidenhair fern, showing the sporangia (right, round), within which spores are produced and midrib (vein, upper left), containing the xylem and phloem of the vascular bundle. Also seen are the upper epidermis (blue) with stomata (pores, green). Beneath this are the parenchyma cells of the palisade mesophyll (green-yellow), containing chloroplasts, and spongy mesophyll (yellow). Magnification: x13 when printed 10 centimetres wide.
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