| | Commercial timbers |
Nomenclature etc. HYPERICACEAE (CLUSIACEAE, GUTTIFERAE). Trade and local names: serungan (MY-SAB); gerunggang, mapat, mulu, sulunus (ID); gonggang (MY). Not protected under CITES regulations.
Tree. Geographic distribution: Myanmar (Burma), Thailand, Laos, Vietnam, Cambodia, Indomalesia.
General. Heartwood basically brown, red (light reddish brown, darkening upon exposure); without streaks. Sapwood colour distinct from heartwood colour. Density 0.42–0.55(–0.75) g/cm³.
Vessels. Vessels present. Wood diffuse porous. Vessels arranged in a diagonal and/or radial pattern, in multiples, commonly in short (2–3 vessels) radial rows or in radial rows of 4 or more. Average tangential vessel diameter 150–250 µm. Average number of vessels/mm² 5–8. Some of the larger vessels typically appended by many small vessels either in radial rows or as irregular clusters. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–7 µm. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type. Tyloses present, thinwalled. Other deposits present (reddish brown).
Tracheids and fibres. Fibres of medium wall thickness. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres non-septate.
Axial parenchyma. Axial parenchyma not banded. Axial parenchyma apotracheal, or paratracheal. Apotracheal axial parenchyma diffuse-in-aggregates. Paratracheal axial parenchyma scanty, or vasicentric. Axial parenchyma as strands. Average number of cells per strand: 8–15.
Rays. Rays 8–11 per tangential mm, multiseriate, 1–2(–3) cells wide. Height of large rays up to 500 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.
Storied structures. Storied structure absent.
Mineral inclusions. Crystals not observed. Silica present, as grains; in rays cells. Silica particles mostly small, more or less circular and with a smooth surface.
Illustrations. • Transverse section. • Tangential section. • Radial section. • Vessel groups. radial groups of very small vessels attached to large ones are a characteristic feature of this timber as seen in transverse (right) and radial (left margin) view.
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’.
