DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Water lily leaf. Light micrograph of a transverse section through the leaf of a water lily (Nympha sp.) plant. All aquatic plants (hydrophytes) have a similar structure. The upper epidermis of the leaf has a thin cuticle (top) underneath which is a multi-layered palisade mesophyll. In-between the palisade cells are elongated sclereids (purple) for support. Underneath this is the spongy mesophyll and large intercellular air spaces (lacunae, white). Magnification: x103 when printed 10 centimetres wide.
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