FIG. 5 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 5. — General features of the regular phloem; A, Tanaecium pyramidatum transverse section (TS), very narrow sieve elements (arrow), sometimes arranged in assemblages (arrowhead). Note that the entire assemblage shows the same dimentions of a single axial parenchyma cell (insert). Rays are generally multisseriate. Axial parenchyma (*) is abundant and form radial rows among the sieve tubes. Fiber bands varying from thin (≤ 3 rows of fibers) to thick (≥ 3 rows of fibers); B, Stizophyllum riparium, TS, thick fiber bands interrupted by phloem rays. Cortex still present along with the primary phloem and pericyclic fibers; C, Amphilophium crucigerum longitudinal tangential section (LT), rays are multisseriate and taller than 1 mm; D, Perianthomega vellozoi, TS, sieve tubes with callose deposition (arrows), indicating loss of function and subsequent collapse (arrowhead); E, Perianthomega vellozoi, TS, dilatation meristem in the nonconducting phloem; F, Dolichandra unguiculata, TS, phloem fibers originated from the cambium (arrows) and belated formation of sclereids from expanded axial parenchyma cells at the level of the nonconducting phloem. Scale bars: A-C, F, 200 μm; D, 120 μm; E, 2 mm. Insert in A, 30 μm.