Tangential longitudinal section (TLS) of Viburnum wood showing ray and parenchyma. A V. wrightii (double arrow head indicate wall thickenings in tracheids, white arrow indicates simple cross wall in parenchyma cells) B V. ordoratissimum var. awabuki (white arrow indicates, oblique cross wall in parenchyma cell) C V. japonicum D V. dilatatum. Abbreviations: bp, bordered pits; ivp, inter-vessel pits. Scale bars: 20 µm.