FIG. 10 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 10. — Secondary phloem of Manaosella, Pachyptera, and Lundia. Transverse sections: A-C, Manaosella cordifolia; A, overall view of the phloem wedge and the variant phloem of Manaosella. Stratified, non-fibrous phloem; B, fiber bands of generally three cells, some of which are tangentially very long. Rays lignify when crossing the fiber bands. Sieve tubes (arrows) diffuse; C, Sieve tubes (*) with one companion cell (arrows) lying at one corner of the sieve tube. Axial parenchyma forms the background tissue. Acicular crystals common in axial and ray parenchyma; D-F, Pachyptera aromatica; D, overall view of the regular phloem, with fiber bands formed by 3-4 polygonal fibers. Axial parenchyma forms the background tissue. Nonconducting phloem evident after the first fiber band, with collapse of sieve tubes (arrow) and dilatation of axial and ray parenchyma; E, overall view of the phloem wedge and variant phloem. Stratified, non-fibrous. Sieve tubes in radial arrangement. Axial parenchyma as the background tissue. Rays lignified when crossing the fiber bands. Fiber bands thin to thick; F, detail of the variant phloem. Sieve tubes (*) solitary or in multiples. One to two companion cells (arrows) lying to the same side of the sieve tube; G-I, Lundia; G, Lundia glazioviana. Overall view of the phloem wedge, variant and regular phloem. Fibrous phloem. Sieve tubes arranged tangentially or in clusters; H, Lundia damazioi. Regular phloem. Thin fiber bands. Axial parenchyma forms the background tissue. Tiny sieve tubes (arrows); I, Lundia damazioi. Variant phloem. Wide sieve tubes (*) solitary or in multiples. Axial parenchyma sieve-tube-centric. One to two companion cells per sieve tube, lying at the same corner of the sieve tube. Abbreviations: cz, cambial zone; fb, fiber band; lr, limiting rays; x, secondary xylem. Scale bars: A, E, 500 μm; B, D, F, I, 100 μm; C, 50 μm; G, 400 μm.