Page 41 – Parallel longitudinal vascular bundles and transverse branches of leaves

Page 41 – Parallel longitudinal vascular bundles and transverse branches of leaves

c. 1940

Fig. 34 . Parallel longitudinal vascular bundles and transverse branches of leaves. A. Portion of a young (i.e., seedling) leaf, cut parallel to the surface to show an early stage, i.e., procambium strands, of longitudinal bundles (lb) and of transverse branches (tb). ra, raphides. X200. B. Portion of a fully developed leaf retted (seen in surface view), to show the ladder-like struture formed by the longitudinal bundles and transverse branches (tb). Notice the alternation of large (lb) with smaller (lb₁) longitudinal bundles, and the branching of a transverse branch at btb. X40. C. Portion of the same, enlarged. Notice the anastomosis of the xylem elements of the branch bundle with those of a longitudinal bundle, at an. X100