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Photomicrographs of the leaf surfaces of the five Ulmus species tested. (a) Scanning electron microscopy (SEM) images of the adaxial leaf surface. (b) SEM images of the abaxial leaf surface. (c) Photomicrographs of the abaxial leaf surface. The white or black bars indicate 100 µm. h, hair; st, stomata. UD, Ulmus davidiana var. japonica; UP, U. parvifolia; UM, U. macrocarpa; UL, U. laciniata; UPU, U. pumila.
