Fig. 1From: Relationship between formation of earlywood vessels and leaf phenology in two ring-porous hardwoods, Quercus serrata and Robinia pseudoacacia, in early springLight micrographs showing the cambial zone on 18th May. Thin cell plates (arrows) were observed in some cambial cells along the entire stems of Quercus serrata (a, b) and Robinia pseudoacacia (c, d). a The cambial zone at the top of a stem of Q. serrata. b The cambial zone in a stem of Q. serrata near the ground. c The cambial zone at the top of a stem of R. pseudoacacia. d The cambial zone in a stem of R. pseudoacacia near the ground. Bars 25 µm (a, c) and 50 µm (b, d)Back to article page