A comparison between the upper leaf epidermis under scanning electron microscope and light microscope, SEM images of internal surface of the upper leaf epidermis displaying the possible origin of the reticulations of the periclinal walls A, B C. aromaticum C, D C. daphnoides E, F C. ilicioides. Scale bars: 10 μm; (A, C); 20 μm; (E); 50 μm (B, D, F).