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Terminalioxylon concordiensis

Magnoliopsida - Myrtales - Combretaceae

Terminalioxylon concordiensis was named by Brea and Zucol (2001). It is considered to be a form taxon. Its type specimen is LPPB 12413, pmLPPB 1234 to 1256, a plant debris (Wood), and it is a 3D fossil preserving soft parts. Its type locality is Punta Viracho, Concordia, which is in a Pleistocene fluvial horizon in the El Palmar Formation of Argentina.

Synonymy list
YearName and author
2001Terminalioxylon concordiensis Brea and Zucol

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classMagnoliopsidaCronquist et al. 1996
EudicotDoyle and Hotton 1991
orderMyrtalesJussieu 1820
familyCombretaceaeBrown 1810
genusTerminalioxylonSchonfeld 1947

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

M. Brea and A. F. Zucol 2001Growth rings delimited by small vessels and narrow lines of terminal parenchyma. Wood with porosity; pores mostly solitary, sometimes in radial multiple series of 2-3 and rarely radial multiple series of 4. Vessels: tangencial diameter 104-224 µm, mean 180.8 µm; 5-16 vessels per square mm; length 176-560 µm (short); perforation plates simple; intervascular pitting alternate and sparce. Tylosis usually absent. Rays: homogenous radial system, rarely heterogeneous, with homocellular rays composed of procumbent cells or heterocellular ones composed of procumbent cells and 1-2 rows of upright and/or square marginal cells; numerous, 4-8 rays per linear mm; frequently uniseriate, rarely with biseriate portion; 136-328 µm high; 24-40 µm wide. Fibres: hexagonal in cross section and septate in longitudinal section; abundant; diameter 11.62-21.58 µm, mean 16.26 µm; walls 4.98-8.3 µm. Axial parenchyma: apotracheal and paratracheal. Apotracheal diffuse and diffuse-in-aggregates; paratracheal usually vasicentric complete to aliform, rarely confluent and of parenchyma terminal bands associated with 2-4 vessels. Crystals numerous, of two types, tetrahedral rod-to styloid-like in cells of ray and cubic in axial parenchyma cells. Secretory elements: intercellular canals of traumatic origin in parenchyma.