Radial growth rate as indicated by ring width influenced ray frequency and dimensions in samples of wood having wide and narrow growth rings of ash (Fraxinus excelsior), Bakain (Melia azedarach), Elm (Ulmas laevigata) and Mulberry (Morus alba). Ash, Elm and Mulberry had significantly more rays per unit area in the sample with wider growth rings than in the sample with narrow growth rings. The rays in bakain samples with wider rings had more cells and cell size was larger, both along their height and width; in elm , cell size was significantly higher but not cell number. No significant relationship was found between rate of growth and either cell number or cell size along the width or height of rays in ash and mulberry.