Bark anatomy of lianescent Bignoniaceae: a generic synopsis Author Pace, Marcelo R. Author Marcati, Carmen R. Author Lohmann, Lúcia G. Author Angyalossy, Veronica text Adansonia 2023 3 2023-05-30 45 12 167 210 journal article 10.5252/adansonia2023v45a12 1639-4798 8006364 Pandorea jasminoides Stratified phloem ( Fig. 19D ), marked by the alternation of fiber bands, interrupted only by the rays, with areas of sieve tubes and axial parenchyma ( Fig. 19D ). Conducting phloem composed of sieve tubes solitary or in multiple of 2-3 ( Fig.19E ), intermingled by axial parenchyma cells ( Fig. 19E ). Sieve plates varying from almost transverse end walls and simple sieve plates, to inclined with 4-5 sieve areas. One companion cell lying on the corner of the sieve tube ( Fig. 19E ) or two companion cells, each on opposite sides of the sieve tube ( Fig. 19E ). Companion cells in strands of 2-4 cells. Axial parenchyma diffuse ( Fig. 19D, E ), abundant, in strands of four cells. Course of rays straight ( Fig. 19D ). Rays bi- to triseriate, heterocellular mixed, with procumbent, square and upright cells intermixed across the entire ray. Rays taller than 1 mm , as seen in tangential section. Rays slightly dilated in the outermost portions of the nonconducting phloem. Rays do not sclerify, not even when touching the fiber bands ( Fig. 19D, E ). Sclerenchyma composed of fibers, polygonal to rectangular in shape ( Fig. 19D, E ). Fibers in tangential bands of 2-3 cells, interrupted by the rays ( Fig. 19D, E ). Non-storied. Nonconducting phloem marked by empty sieve elements and companion cells, collapsed. Cell expansion common, dilatation of rays, no further sclerification seen. Pericyclic fibers forming a ring of discrete strands before a remaining cortex. Single periderm, phellem non-stratified, with evenly thin-walled cells, phelloderm non-stratified, thick, with three or more cell layers ( Fig. 19F ).