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Nomenclature etc. DIPTEROCARPACEAE. Syn.: Shorea agsaboensis. Trade and local names: meranti punai bukit, seraya punai bukit, dark red meranti, dark red seraya (MY); mandirawan (ID-sum). Not protected under CITES regulations.
Tree. Geographic distribution: Thailand, Laos, Vietnam, Cambodia, Indomalesia.
General. Heartwood basically brown to red (from light to dark hues); without streaks. Sapwood colour distinct from heartwood colour. Density 0.6–0.75 g/cm³.
Vessels. Wood diffuse porous. Vessels in multiples, commonly in short (2–3 vessels) radial rows. Average tangential vessel diameter 155–208–295 µm. Average number of vessels/mm² 3–9. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–9 µm, pits vestured and not vestured. Vessel-ray pits with distinct borders or with reduced borders or apparently simple, similar to intervessel pits, rounded or angular or horizontal to vertical, of the same type in adjacent elements or unilaterally compound and coarse. Tyloses present, thinwalled.
Tracheids and fibres. Vascular or vasicentric tracheids commonly present. Fibres of medium wall thickness to very thick-walled. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma banded (axial resin canals embedded in parenchyma bands). Bands not marginal (or seemingly marginal). Axial parenchyma apotracheal and paratracheal. Apotracheal axial parenchyma rarely diffuse, or diffuse-in-aggregates. Paratracheal axial parenchyma vasicentric, aliform, and unilateral. Aliform parenchyma of the lozenge type, or of the winged type. Axial parenchyma as strands. Average number of cells per strand: 4–7.
Rays. Rays 4–8 per tangential mm, multiseriate, 2–6 cells wide. Rays of one size. Height of large rays commonly 500 to 1000 µm, or commonly over 1000 µm. Rays composed of two or more cell types (heterocellular). Heterocellular rays with square and upright cells restricted to marginal rows, mostly 1 marginal row of upright or square cells or mostly 2–4 marginal rows of upright or square cells or with more than 4 marginal rows of upright or square cells.
Storied structures. Storied structure present, rays not storied, axial parenchyma storied.
Secretory structures. Intercellular canals present, oriented axially and oriented radially, axial intercellular canals in long tangential lines and in short tangential lines. Diamter of radial resin canals up to 200 µm.
Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells. Crystal-containing axial parenchyma cells not chambered. Number of crystals per cell or chamber one. Crystal containing cells of normal size and enlarged (idioblasts). Silica not observed.
Illustrations. • Transverse section. axial intercellular canals (IC) in tangential bands. IC. • Tangential section 1. radial intercellular canals (IC), small. IC. IC. • Tangential section 2. IC. IC. radial intercellular canals (IC), large. • 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’.
