MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Watermilfoil (Myriophyllum sp.) stalk. Polarised light micrograph of a longitudinal section through the stalk of a watermilfoil plant, showing the air canals (blue), druses (small yellow crystals) and starch grains (round) filling the cells. Magnification: x200 when printed 10 centimetres wide.
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