DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Phloem plant cells. Light micrograph of a transverse section through phloem tissue and sieve plates in a Cucurbita plant. The tissues from top are: parenchyma (large cells); phloem with sieve plates (blue); cambium (small cells); xylem (red). Magnification: x100 when printed at 10 centimetres wide.
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