HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Lignin formation in leaf tissue. Light micrograph of a cross-section through a Camellia leaf, showing sclereid structures. These include lignin (star-shaped, blue) that has formed on sclerenchyma cells within the leaf tissue. Magnification: x220 when printed at 10 centimetres across.
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