FIG. 14 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 14. — Secondary phloem of the Multiples of four clade: A-E, transverse sections: A-C, E, variant phloem. Non-fibrous, sieve tubes (arrows) in radial multiples. Axial parenchyma also forming radial rows. Crystalliferous parenchyma around fiber bands (arrowheads), prismatic crystals present. In E some styloid crystals along the prismatic crystals. Limiting rays (lr) lignified only to the xylem face. Rays lignify only when crossing the fiber bands in A, B, never lignifying in C; E, fiber bands thin, with two-three layers of cells; A, Bignonia sciuripabulum; B, Mansoa difficilis; C, Pyrostegia venusta; D, Anemopaegma laeve regular phloem; E, Anemopaegma laeve. Sieve tubes (arrows) narrow. Sometimes in assemblages (yellow arrow); F, Mansoa difficilis radial section. Sieve tubes with compound sieve plates (arrowhead) and over a millimeter. Abbreviations: cz, cambial zone; lr, limiting ray. Scale bars: A, B, F, 100 μm; C, 200 μm; D, E, 50 μm.