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Penarahan
Knema laurina Warb.
MYRISTICACEAE
Hna chang (Thailand); penerahan sanak (Malaysia); Penarahan hitam (Malaysia); Chendarahna hitam (Malaysia); Pianggu pipit (Indonesia); Kajeng rah (Indonesia); Huru tangkalak (Indonesia)
Knema cantleyi (Hook. f.) Warb. p. p.
It is a small to medium sized, rarely large, tree up to 40 m tall. The bole is straight, cylindrical, branchless for up to 15 m, with a diameter of 60 cm. Sometimes small buttresses or stilt roots are reported.
Knema laurina is found scattered in lowland to montane rain forest, up to 1,700 m of altitude.
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Colored deposits in heartwood vessels. Vessels per mm2 more than 20 (very abundant). Simple perforation plates. Vessel-ray pits s Axial parenchyma in marginal or in seemingly marginal bands. Over 9 cells per parenchyma strand. Axial parenchyma bands more than 3 cells wide. Rays more than 10 per mm (abundant). Rays exclusively uniseriate. Prismatic crystals in radial alignment in procumbent ray cells (chambered cells). Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Fibers with distinctly bordered pits.
Unrestricted
The sapwood is not clearly differentiated from the heartwood. The wood is pale brown to red brown, sometimes dark purplish brown to dark red.
5
This species is reported to have straight grain.
The texture is moderately fine to slightly coarse.
It is readily attacked by fungi and insects if exposed.
5
The heartwood is moderately resistant to preservative treatment, but the sapwood can be easily treated.
0.62
0.69
6.9
4.6
Ease of Drying: Air seasoning is reported to be good with little degrade.
UK-H; US-T10-D4S
1.5
443
454
Sawmilling of this species is reportedly easy.
Lamination of this species is possible.
Lamination of this species is possible.
Planing operations are rather easy.
Molding operations give satisfactory results.
Wood of this species is easy to finish.
This species is reported to be easy to polish.
HOUSING GENERAL, shutter boards, PLYWOOD AND VENEER, PACKING, OTHER AND MUSICAL INSTRUMENTS, matches, paper
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