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Moss leaf. Brightfield illuminated light micrograph of a section through a leaf from a moss (Plagiomnium rostratum) plant, showing the network of cells arranged in a roughly hexagonal pattern, with their cell walls (bright lines) between them. Magnification: x313, when printed 10 centimetres wide. (KEYSTONE/SCIENCE PHOTO LIBRARY/JOHN DURHAM/SCIENCE PHOTO LIBRARY)