Figure 3 in Structural changes in needle epicuticular waxes of Balkan Abies species in relation to natural weathering

Figure 3. SEM micrographs of A. cephalonica epicuticular waxes. A-F. Adaxial surface of needles with noticeable granules; G-I. Abaxial surface of needles with two stomatal bends; J-L. Abaxial stomatal rows; M-O. Stomatal pores occluded either by wax tubules or by wax crusts; P-R. Agglomeration, thickening and fusion of tubules with needle aging. Bars: A-I = 500 μm; J-L = 50 μm; D-O = 10 μm; P-R = 1 μm.