CITESwoodID: descriptions, illustrations, identification and information retrieval


H. G. Richter, K. Gembruch, G. Koch

Pterygota spp. (Kasah, Koto)

Nomenclature. Family: STERCULIACEAE. Other trade relevant species: P. alata, P. amazonica, P. bequaertii, P. brasiliensis, P. columbiana, P. horsfieldii, P. macrocarpa. Synonym(s): Sterculia thompsonii, Pterygota cordifolia. Further trade and local names: akodiakédé, bofo ouale, bontue, pohoure, waré (CI); Pterygota (GB); awari, kyere, wawampe (GH); efok, kion (CM); kefe, poroporo, oporipo (NG); aké (GA); ikame (CD); kakende (CF). Code according to DIN EN 13556: PQXX. Internal code: KOT.

CITES(EU) status of protection. Not protected.

Geographic distribution. Tropical Africa (other Pterygota species also in tropical Southeast Asia and South America).

Growth rings, colour, grain, etc. Growth ring boundaries distinct, or indistinct or absent. On sites with a seasonal climate growth increment borders are often pronounced, demarcated by dark fibre bands (practically void of axial parenchyma bands). Heartwood basically yellow to white or grey; without streaks. Sapwood similar to heartwood colour. In older trees a brown, streaky inner heart up to 30 cm in diameter is quite common. The high rays give the timber a striking lustrous fleck figure on accurately quarter-sawn stock. The frequent axial parenchyma bands, of a rather dull appearance under incident light, can be recognized as subtle V-shaped markings on flat-sawn, and as fine lines on radial surfaces. Wood of medium weight (0,46–0,55–0,63 g/cm3). Interlocked grain absent.

Hardwood vs softwood. Vessels (pores) present (= hardwood).

Vessels (pores). Wood diffuse-porous. Vessels (pores) in multiples; commonly in short (2–3 vessels) radial rows. Vessels large (95–180–240 µm); very few (1–4). Tyloses absent. Other deposits in heartwood vessels (pores) present (light in colour, infrequent), or absent (in case sapwood is mistaken for heartwood).

Axial parenchyma. Axial parenchyma present; banded. Parenchyma bands not (only) marginal; wide; forming a reticulate pattern with rays. Other macroscopically visible types of axial parenchyma: diffuse-in-aggregates and vasicentric.

Rays. Rays narrow. Large rays commonly between 1 mm and 5 mm high.

Resin canals. Normal resin canals absent.

Physical and chemical tests. Heartwood not fluorescent (the bluish colour is based on reflection the ultraviolet radiation, not on fluorescence). Water extract not fluorescent; colourless to brown. Ethanol extract not fluorescent; colourless to brown. Froth test positive. Splinter burns to full ash, or to partial ash; colour of ash white to grey.

Additional information. Informationsdienst Holz Merkblatt Nr. 8. • kot.jpg. Tangential surface, natural size. Transverse section ca. 10x. Pterygota spp. (Kasah, koto).

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., Gembruch, K., and Koch, G. 2014 onwards. CITESwoodID: descriptions, illustrations, identification, and information retrieval. In English, French, German, and Spanish. Version: 16th May 2014.’.