• Borrill, M. (1961). The developmental anatomy of leaves of Lolium temulentum. Ann. Bot. n.s., 25, 1.
  • Cooper, J. P. (1958). The effect of gibberellic acid on a genetic dwarf in Lolium perenne. New Phytol., 57. 235.
  • Evans, P. S. (1964). A comparison of some aspects of the anatomy and morphology of Italian ryegrass (Lolium multiflorum Lam.) and perennial ryegras (L. perenne L.). N.Z. Jl Bot., 2, 120.
  • Friend, D. J. C. (1961). The control of chlorophyll accumulation in leaves of Marquis wheat by temperature and light intensity. II Chlorophyll contents relative to leaf area and thickness. Physiologia Pl, 14, 28.
  • Gabrielsen, E. K. (1948). Effects of different chlorophyll concentrations on photosynthesis of foliage leaves. Physiologia Pl, 1, 5.
  • Hardwick, K., Wood, M. & Woolhouse, H. W. (1968). Photosynthesis and respiration in relation to leaf age in Perilla frutescens (L.) Britt. New Phytol., 67, 79.
  • Holmgren, P. (1968). Leaf factors affecting light-saturated photosynthesis in ecotypes of Solidago virgaurea from exposed and shaded habitats. Physiologia Pl, 21, 676.
  • Hunt, L. A. & Cooper, J. P. (1967). Productivity and canopy structure in seven temperate forage grasses. J. appl. Ecol, 4, 437.
  • Kemp, C. D. (1959). Estimation of leaf area by regression techniques. A. Rep. Expl Prog. Grassld Res. Inst., 11. p. 90.
  • Leopold, A. C. (1964). Plant Growth and Development. New York .
  • Mac Coll, D. (1965). Studies on the growth of varieties and climatic races of herbage grasses. Ph.D. thesis, University of Wales.
  • Mc Clendon, J. H. (1962). The relationship between the maximum thickness of deciduous leaves and their maximum photosynthetic rate. Am. J. Bot., 49, 320.
  • Mitchell, K. J. (1953). Influence of light and temperature on the growth of ryegrass (Lolium spp.). 1. The pattern of vegetative development. Physiologia Pl, 6, 21.
  • Sant, F. I. (1968). Major gene differences in Lolium. Rep. Welsh Pl Breed. Stn, 1967, 27.
  • Soper, K. & Mitchell, K. J. (1956). The developmental anatomy of perennial ryegrass (Lolium perenne L.). N.Z. Jl Sci. Technol, A37, 484.
  • Treharne, K. J., Cooper, J. P. & Taylor, T. H. (1968). Growth response of orchardgrass (Dactylis glomerata L.) to different light and temperature environments. II. Leaf age and photosynthetic activity. Crop Sci., 8, 441.
  • Wilson, D. (1968). Growth and assimilation in Lolium. Ph.D. thesis, University of Wales.
  • Wilson, D. & Cooper, J. P. (1967). Assimilation of Lolium in relation to leaf mesophyll. Nature. Lond., 214, 989.
  • Wilson, E.) & Cooper, J. P. (1969a). Assimilation and growth of Lolium populations in the glasshouse in contrasting light intensities. Ann. Bot.n.s, (In press.).
  • Wilson, D. & Cooper, J. P. (1969b). Effect of light intensity and CO2 on apparent photosynthesis and its relationship with leaf anatomy in genotypes of Lolium perenne L. New Phytol., 68, 627.
  • Wilson, D., Treharne, K. J., Eagles, C. F. & de Jager, J. M. (1969). A manometric technique for determination of apparent photosynthesis of Lolium. J. exp. Bot. (In press.).