Commercial Timbers

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H. G. Richter and M. J. Dallwitz

Myrcianthes pungens (Berg.) Legrand (Guaviju)

Nomenclature etc. MYRTACEAE. Not protected under CITES regulations.

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, exclusively solitary. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 10–24–42 µm; diameter of vessel lumina: small. Average number of vessels/mm² 105–137–179; vessels per square millimetre very numerous. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 5–7 µm (pits between vessels and tracheids), 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 not observed.

Tracheids and fibres. Vascular or vasicentric tracheids commonly present. Fibres of medium wall thickness. Fibre pits common in both radial and tangential walls, distinctly bordered. Helical thickenings absent. Fibres non-septate.

Axial parenchyma. Axial parenchyma present, banded. Axial parenchyma bands not marginal (or seemingly marginal), bands much wider than rays, fine, up to three cells wide and coarse, more than three cells wide. Parenchyma bands 2–6 cells wide, sometimes discontinuous. Axial parenchyma apotracheal. Apotracheal axial parenchyma diffuse and diffuse-in-aggregates. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 3–5. Unlignified parenchyma absent.

Rays. Rays present, 15–18–21 per tangential mm, multiseriate (also if only few), (1–)2(–3) cells wide, narrow (2–3 seriate). Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Height of large rays commonly 500 to 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 and mostly 2–4 marginal rows of upright or square cells. Sheath cells absent. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls distinct.

Storied structures. Storied structure absent.

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

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

Mineral inclusions. Crystals not observed. Cystoliths absent. Long chains of prismatic crystals observed only at the periphery of traumatic tissues. Silica not observed.

Illustrations. • Transverse section. Myrcianthes pungens. • Tangential section. Myrcianthes pungens. • Radial section. Myrcianthes pungens.


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. http://delta-intkey.com’.

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