FIG. 11 in Bark anatomy of lianescent Bignoniaceae: a generic synopsis

FIG. 11. — Secondary phloem of the Cuspidaria-Tynanthus clade: A-F, transverse sections; G, longitudinal tangential section; A, overall view of the phloem at the wedge and interwedges. Fibrous variant phloem, Tynanthus cognatus; B, detail of the variant phloem. Sieve tubes radially elongated (*), generally in tangential multiples, surrounded by sieve-tube-centric parenchyma, all embedded in a matrix of fibers. Two to four companion cells per sieve tube, lying on their corner (arrows), Tynanthus cognatus; C, Fibrous phloem. Sieve tubes (*) solitary or in tangential multiples. Sieve-tube centric parenchyma, Cuspidaria convoluta; D-F, comparison of the sieve tube dimensions on regular and variant portion of Tynanthus cognatus; D, regular phloem with thin fiber bands and assemblages (arrows); E, variant phloem. Sieve tubes with two to four (or more) companion cells, lying at the same corner of the sieve tube; F, Variant phloem of Cuspidaria convoluta. Sieve tubes (*) solitary or in multiples. Parenchyma band present (arrows); G, sieve tubes are lower than 1 mm, with inclined, compound sieve plates. Rays varying from 2 to 8-seriate. Scale bars: A, G, 200 μm; B, C, 100 μm; D-F, 50 μm.