Page 15 – Stem structure
Fig. 12 . Stem structure. Series of transverse sections of a stem of a 13-months-old seedling cut at different levels to show the development of the axis. A. In the region where the "ring" of specialized tissue is well defined (300/ᵘ below the extreme apex of the stem). B. In a region 405/ᵘ below A, to show the first indication of root initiation, at r. C. In a region 270/ᵘ below B, to show the definite formation of an adventitious root (r). c, cortex; s, stele. X25.