The definition of latewood proposed by Mork (1928) is discussed and quoted in full since it has been interpreted in two ways by subsequent authors. Some examples are given to illustrate differences in percentage latewood calculated according to the two versions of Mork's formula.

To elucidate the influence of growth rate and cambial age on latewood density in oak (Quercus robur L.), the diameter and wall thickness of libriform fibres, and percentage of latewood area occupied by libriform fibres and vessels, were analysed across discs often 87-year-old oak trees from Germany.

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