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Nomenclature etc. COULACEAE (OLACACEAE). + Minquartia punctata (Radlk.) Sleumer. Trade and local names: macaa, lamincouaru (GF); huacapú (PE); pachiche (EC); acaricorana, acariúba (BR). Not protected under CITES regulations.
Description based on 6 specimens. Tree. Geographic distribution: Mexico and Central America, tropical South America.
General. Heartwood basically brown. Sapwood colour distinct from heartwood colour. Density 0.85–1 g/cm³.
Vessels. Wood diffuse porous. Vessels arranged in no specific pattern, in multiples, commonly in short (2–3 vessels) radial rows to in radial rows of 4 or more. Average tangential vessel diameter 60–80–110 µm. Average number of vessels/mm² (15–)25–35. Average vessel element length 600–850–1100 µm. Perforation plates scalariform, with 4–10 bars. Intervessel pits alternate, average diameter (vertical) 8–11 µm. Pits rather loosely arranged, mostly oval (horizontally extended). Vessel-ray pits with reduced borders or apparently simple, different from intervessel pits, rounded or angular. Tyloses present, thinwalled. Other deposits present (dark greyish brown).
Tracheids and fibres. Fibres very thick-walled. Average fibre length 1000–1500–2000 µm. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma apotracheal. Apotracheal axial parenchyma diffuse. Axial parenchyma as strands. Average number of cells per strand: 7–14.
Rays. Rays 18–22 per tangential mm, multiseriate, 2(–4) cells wide. Rays with multiseriate portions as wide as uniseriate portions present. Height of large rays commonly 500 to 1000 µm. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, with more than 4 marginal rows of upright or square cells (up to 14 marginal rows).
Secretory structures. Oil and mucilage cells absent.
Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Silica not observed.
Illustrations. • Transverse section. • Tangential section. • Radial section.
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: 9th April 2019. delta-intkey.com’.
