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Diania
Celtis tessmannii Rendle
ULMACEAE
Zuwo (Nigeria); Ita (Nigeria); Dunki (Nigeria); lokonfi (Liberia); esa-kosua (Ghana); Esa-biri (Ghana); Lohonfé (Côte d`Ivoire); African celtis (United Kingdom); Diania (Zaire); Engo (Gabon); Ekembe bakaswa (Uganda); Kiliakamba (Angola); Celtis
The tree reaches a height of 40 m. The bole is cylindrical, but is often curved with alate buttresses.
Celtis tessmannii is locally frequent in the drier primary forests.
It is found in western, central and parts of eastern Africa.
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Occasionally white deposits in heartwood vessels. Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium) Occasionally axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma aliform. Prismatic crystals in non-chambered axial parenchyma cells. 5 to 8 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Prismatic crystals in the ray cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Non-septate fibers. Fibers with simple to minutely bordered pits.
Unrestricted
Light and pleasant odor.
The heartwood is white or light-yellow when freshly cut, turning grey-white with age, it is not clearly demarcated.
7
Straight or sometimes interlocked. Usually interlocked grain is absent or very slight, without any effect on further processing operations.
Texture of this species is reported to vary from fine to medium.
Timber of this species is low in luster.
Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.
5
No growth stresses are reported in this species.
Silica Content: It is reported to have silica. Contents over 0.05% may affect wood processing. Silica Value: 0.13
Easy to treat with a full penetration of the preservative products using vacuum-pressure method.
0.66
0.74
7.4
4.1
FR-7
1.8
1156
171119
613
81
87
680
770
It is easy to saw.
Suitable for slicing, also suitable for peeling if treated.
Suitable for slicing, also suitable for peeling if treated.
Slight blunting effect; ordinary tools can be used for sawing and machining.
Machining of this species is reportedly easy.
Moderately easy; tools must be cautiously sharpened.
Easy; no particular problems.
30
Easy; no particular problems.
Easy; no particular problems.
Pre-boring is necessary.
Glues well if basic gluing technical rules are followed.
Easy to perform; it gives good results.
Can be polished without surface preparation.
This species can be used for steam bending.
No particular problems.
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