Commercial Timbers


H. G. Richter and M. J. Dallwitz

Bastardiopsis densiflora (Hook. & Arn.) Hassler (Loro blanco)

Nomenclature etc. MALVACEAE. Trade and local names: loro blanco (PY); jangada-brava, algodão, vassourão (BR); peterebi-moroti, loro blanco (AR). Not protected under CITES regulations.

Description based on 3 (specimens). Tree. Geographic distribution: southern Brazil and temperate South America.

General. Growth ring boundaries distinct. Growth ring limits demarcated by a band of smaller and thick-walled cells (latewood) in combination with a slight thickening of the rays. Heartwood basically yellow and white or grey, without streaks. Sapwood colour similar to heartwood colour. Odour indistinct or absent. Density 0.6–0.7 g/cm³.

Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows, radial rows of 4 or more, and in clusters. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 110 µm; diameter of vessel lumina: large. Average number of vessels/mm² 13; vessels per square millimetre few. Average vessel element length 250 µm. Average vessel element length short. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–6 µm, small, not vestured. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type, of the same type in adjacent elements, located throughout the ray. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present, organic contents in some vessels, colour of amber.

Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled, or of medium wall thickness. Average fibre length 1100 µm. Average fibre length medium. Fibre pits common in both radial and tangential walls, simple to minutely bordered. Helical thickenings absent. Fibres non-septate.

Axial parenchyma. Axial parenchyma present, not banded. Axial parenchyma paratracheal. Paratracheal axial parenchyma vasicentric, aliform, and confluent. Aliform parenchyma winged. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2–4(–6). Unlignified parenchyma absent.

Rays. Rays present, 3–7–10 per tangential mm, multiseriate (also if only few), 1–7 cells wide, narrow (2–3 seriate) and wide (5–10 seriate). Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of two distinct sizes. Height of large rays commonly 500 to 1000 µm. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent. Sheath cells absent. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls indistinct or absent.

Storied structures. Storied structure present, some rays storied, some not, axial parenchyma storied, vessel elements storied, fibres storied. Arrangement of tiers regular (horizontal or straight). Only narrow (1–3 seriate) rays storied.

Secretory structures. Oil and mucilage cells absent. Intercellular canals absent. Laticifers or tanniniferous tubes absent.

Cambial variants. Included phloem absent. Other cambial variants absent.

Mineral inclusions. Crystals present, prismatic, located in ray cells. Crystal-containing ray cells procumbent, upright and/or square ray cells not chambered. Crystals in procumbent ray cells not in radial alignment. Number of crystals per cell or chamber one. Crystal containing cells of normal size. Cystoliths absent. Silica not observed.

Physical and chemical tests. Heartwood not fluorescent. Water extract not fluorescent; basically colourless to brown or shade of brown. Heartwood extractives not leachable by water. Ethanol extract not fluorescent. Colour of ethanol extract colourless to brown or shade of brown. Chrome azurol-S test positive (only along the perimeter of the reaction area). Froth test positive (weakly). Splinter burns to partial ash. Ash white to grey.

Illustrations. • Transverse section. Bastardiopsis densiflora. • Tangential section. Bastardiopsis densiflora. • Radial section I. Bastardiopsis densiflora. • Radial section II. Bastardiopsis densiflora.

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.’.