Commercial Timbers


H. G. Richter and M. J. Dallwitz

Ecclinusa spp. (Ucuquirana)

Nomenclature etc. SAPOTACEAE. E. guianensis, E. lanceolata, E. obovata. Trade and local names: chicle, coquirana, guac (sAm); bartaballi, asepoko (GY); abiurana (BR); jaune d'oeuf (GF); jamboka. Not protected under CITES regulations.

Description based on 10 specimens. Tree. Geographic distribution: tropical South America.

General. Heartwood basically brown (with a pinkish or greyish tinge). Sapwood colour similar to heartwood colour. Density 0.57–0.75 g/cm³.

Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in diagonal and/or radial pattern, in multiples, commonly short (2–3 vessels) radial rows or radial rows of 4 or more. Average tangential vessel diameter 59–94 µm. Average number of vessels/mm² 13–57. Average vessel element length 560–920 µm (data from Kukachka, May 1981). Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 4–8 µm. Vessel-ray pits with reduced borders or apparently simple, horizontal to vertical, of two distinct sizes or types in the same ray cell. Tyloses in vessels present.

Tracheids and fibres. Vascular or vasicentric tracheids commonly present. Fibres of medium wall thickness. Average fibre length 950–1410 µm (data from Kukachka, May 1981). Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.

Axial parenchyma. Axial parenchyma banded. Axial parenchyma bands fine, up to three cells wide. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 3–8.

Rays. Rays 12–18 per tangential mm, multiseriate (also if only few), 1–2 cells wide. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows or procumbent, square and upright cells mixed throughout the ray, mostly 2–4 marginal rows of upright or square cells. Disjunctive ray parenchyma end walls distinct.

Storied structures. Storied structure absent.

Mineral inclusions. Crystals not observed. Silica present, as grains, in rays cells or in axial parenchyma.

Physical and chemical tests. Heartwood not fluorescent. Water extract fluorescent (light green); basically colourless to brown or shade of brown to red or shade of red. Ethanol extract fluorescent (light blue). Colour of ethanol extract colourless to brown or shade of brown, or yellow or shade of yellow. Froth test positive.

Illustrations. • Transverse section. Ecclinusa guianensis. • Tangential section. Ecclinusa guianensis. • Radial section. Ecclinusa guianensis. • Miscellaneous. Ecclinusa guianensis. Other specimen with more pronounced dendritic pore distribution. Silica particles (SI) in rays. SI. SI. SI. SI.

The interactive key allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, and geographical distribution.

Cite this publication as: ‘Richter, H.G., and Dallwitz, M.J. 2000 onwards. Commercial timbers: descriptions, illustrations, identification, and information retrieval. In English, French, German, Portuguese, and Spanish. Version: 25th June 2009.’.