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Radial and longitudinal variation in fibre wall percentage, area percentage of vessels and resin canals and specific gravity was studied in five superior six-year-old plantation grown trees of red meranti (Shorea leprosula, S. parvifolia and S. pauciflora). In another 23 trees of these species specific gravity was measured at breast height.

Longitudinal variation in fibre wall percentage, area percentage of vesse ls and resin canals and specific gravity was studied at three to five height levels in three naturally and five plantation grown trees of Light Red Meranti (Shorea leprosula and S. parvifolia).

The wood formation of kapur (Dryobalanops sumatrensis) and tembaga (Shorea leprosula), growing under a weak seasonal climate in West Malaysia was studied over a four-year period using cambium marking. Technical problems arose from the heavy callus formation due to the wounding of the cambium, the small radial increment, and the high variability of the cambial activity around and along the stem. Wood formation in the two tree species appears to be a continuous process and not related to seasonality in rainfall and phenology.

The wood quality parameters of cell wall percentage, tissue proportions and basic specific gravity were determined for three naturally and nine plantation grown trees of Light Red Meranti (Shorea leprosula and S. parvifolia).