The variations in tracheid characteristics of earlywood and latewood of 4 species of Larix spp.and their hybrids with L.kaempferi as female parent were studied.The results are as follows: The tracheid characteristics and microfibril angle met or surpassed the requirements needed for superior pulp and paper properties.There were significant or extremely significant differences in the tracheid characteristics of earlywood and latewood among the species and hybrids.The variations of tracheid length for earlywo...