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E Upper and lower epidermis, Sz Guard cell, P Cells of the palisade parenchyma, S Cells of the spongy parenchyma, I Intercellular space. The classic light microscopy reveals the cell contents while an imprint of the surface is made in scanning electron microscopy. The shape of the cells is therefore well visible but the cell content cannot be displayed. (C. E. JEFFREE, J. E. DALES, S.C. FRY 1986)