dc:description"FIG. 8. — Secondary phloem of Stizophyllum and Martinella: A-E, G-I, transverse sections: F, longitudinal radial section; A-F, Stizophyllum riparium; A, overall view of the phloem wedge, with a fibrous phloem, with alternating parenchymatic bands; B, regular phloem. Thick fiber bands, multisseriate rays; C, detail of the regular conducting phloem, showing narrow sieve tubes (arrowheads) and assemblages (arrow); D, variant phloem, fibrous, with sieve tubes solitary or in radial multiples, parenchyma band present; E, detail of the variant phloem. Sieve tubes with one to three companion cells, lying on the same side of the sieve tube (yellow arrowhead). Axial parenchyma sieve-tube-centric incomplete;F, heterocellular mixed rays, sieve tubes with compound sieve plates (arrowheads), radial sieve element present (arrow); G-I, Martinella obovata; G, regular phloem. Thin fiber bands, multisseriate rays; H, overall view of the phloem wedge, non-fibrous phloem; I, detail of the variant phloem. Sieve tubes solitary or in radial multiples. Fiber bands thin. Abbreviations: cz, cambial zone; fb, fiber bands; iw, interwedge;lr, limiting ray; pw, phloem wegde; rp, regular phloem; se, sieve element; x, secondary xylem.Scale bars:A, H, 1 mm; B, D, 200 μm; C, E, 50 μm; F, I, 100 μm; G, 500 μm.";
