DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Ginkgo leaf stalk. Light micrograph of a transverse section through the leaf stalk (petiole) of a ginkgo tree (Ginkgo biloba). The outer epidermis (black-brown) surrounds the cortex, which consists of parenchyma cells (blue) with inter-cellular spaces and resin canals (white spacess) characteristic of gymnosperms. The kidney-shaped vascular cylinder (centre) is surrounded by a single-layer endodermis, inside which are the tracheid cells (red) of the xylem and the sieve cells (blue and light orange) of the phloem. Magnification: x14 when printed 10 centimetres wide.
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