Fig. 1From: Super-resolution imaging of Douglas fir xylem cell wall nanostructure using SRRF microscopyMeasurement of margo fibrils by SEM indicates an average thickness of 56 nm and a range of 20–120 nm. a Bordered pits (bp) in radial longitudinal view. Scale bar: 10 μm. b A close-up view of the torus (t) and margo (m). Scale bar: 1 μm. c Frequency distribution of margo fibril diameterBack to article page