FIG. 16 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 16. — Secondary phloem of Dolichandra: A-D, transverse sections; B, Dolichandra unguiculata. All other photos are from Dolichandra unguis­cati; A, limiting rays non-lignified, tend to expand and divide (arrows), non-fibrous phloem. Thin fiber bands; B, non-fibrous phloem, sieve tubes in short radial multiples. Limiting rays non-lignified; C, pith also undergo divisions, uniting to divisions at the limiting rays (arrowheads). Nonconducting phloem collapsed; D, detail of the conducting variant phloem. Sieve tubes (arrows) with one or two companion cells. Acicular crystals abundant; E, tangential section. Storied structure in both axial and ray cells; F, radial section. Sieve tube elements with compound sieve plates (arrow). Abbreviations: cz, cambial zone; pi, pith. Scale bars: A, 200 μm; B, E, 150 μm; C, 500 μm; D, 50 μm; F, 100 μm.