Gilibertia cuneata (DC.) March.(amba'y ra)
Nomenclature etc. ARALIACEAE. Syn.: Dendropanax cuneatum (DC.) Dcne & Planch. Trade and local names: amba'y ra, ombu ra (PY). Status of protection under CITES regulations: not protected.
Description based on: 1 specimen. Tree. Geographic distribution: southern Brazil.
General. Growth ring boundaries indistinct or absent.
Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows and in clusters. Vessel outline angular. Two distinct vessel diameter classes absent. Perforation plates scalariform and reticulate, foraminate or other types, with (1–)3–5(–10) bars. Intervessel pits scalariform, opposite, and alternate, average diameter (vertical) 8–12 µm, medium, not vestured. Vessel-ray pits with reduced borders or apparently simple, rounded or angular, of two distinct sizes or types in the same ray cell, of the same type in adjacent elements, located throughout the ray. Helical thickenings absent. Tyloses in vessels present, thinwalled. Other deposits in heartwood vessels present.
Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled. Fibre pits common in both radial and tangential walls, simple to minutely bordered. Helical thickenings absent. Fibres exclusively septate. Septate fibres evenly distributed.
Axial parenchyma. Axial parenchyma present, not banded. Axial parenchyma paratracheal. Paratracheal axial parenchyma scanty. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 3–8. Unlignified parenchyma absent.
Rays. Rays present, multiseriate, also if only few, (1–)3–5(–6) cells wide, commonly 3–5 cells wide. Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Rays composed of two or more cell types. Heterocellular rays square and upright cells restricted to marginal rows. Number of marginal rows of upright or square cells 1. Sheath cells present. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls indistinct or absent.
Storied structures. Storied structure absent.
Secretory structures. Oil and mucilage cells absent. Intercellular canals present, non-traumatic origin, radial type. Laticifers or tanniniferous tubes absent.
Cambial variants. Included phloem absent. Other cambial variants absent.
Mineral inclusions. Crystals not observed. Silica not observed.
Cite this publication as: H. G. Richter and M. J. Dallwitz (2000 onwards). 'Commercial timbers: descriptions, illustrations, identification, and information retrieval.' In English, French, German, and Spanish. Version: 4th May 2000. http://biodiversity.uno.edu/delta/.
Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993 onwards, 1995 onwards, 1998) should also be cited (see General references).