Fig. 4From: Low intra-tree variability in resistance to embolism in four Pinaceae speciesLight microscopy images showing anatomical details of xylem tracheids in transverse sections of branches (a, b) and roots (c, d) from P. pinaster (a, c) and P. menziesii (b, d). Tracheid and torus-margo pits (arrows) are significantly different in size between branches and roots, especially in P. pinaster Back to article page