FIG. 18 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 18. — Secondary phloem of Adenocalymma: A-G, transverse sections; A, Adenocalymma bracteatum, thin fiber bands. Single periderm with a thin-walled phellem, and a thick-walled phelloderm; B, Adenocalymma flaviflorum variant phloem. Non-fibrous, sieve tubes in radial multiples of 2 till 5 cells. Rays lignify when crossing the fiber bands; C, Detail of the variant phloem of Adenocalymma flaviflorum. Sieve tubes typically with two companion cells, each lying on a different corner. Axial parenchyma as the background tissue; D, Adenocalymma divaricatum variant phloem. Fibrous-phloem. Sieve tubes in tangential arrangement. Rays with portions lignified and non-lignified; E, Adenocalymma comosum variant phloem. Semi-fibrous phloem. U-shaped fiber bands. Sieve tubes in radial multiples of two to three cells, rarely solitary; F, G, Adenocalymma alboaurantiacum variant phloem. Fibrous-phloem. Sieve tubes with a tangential arrangement. Rays sometimes lignify when crossing the fiber bands. Axial parenchyma sieve-tube-centric. Crystals abundant; G, detail of the styloid crystals in rays (arrowhead). Prismatic crystals also present. Abbreviations: cz, cambial zone; pe, periderm; x, secondary xylem. Scale bars: A, D, 200 μm; B, E, 150 μm; C, G, 50 μm; F, 100 μm.