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REFERENCES

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  • Griffiths, H. B., Greenwood, A. D. & Millbank, J. W. (1972). The frequency of heterocysts in the Nostoc phycobiont of the lichen Peltigera canina Willd. New Phytol., 71, II.
  • Hill, D. J. (1975). The pattern of development of Anabaena in the Azolla-Anabaena symbiosis. Planta (Berl.), (in press).
  • Hitch, C. J. B. & Millbank, J. W. (1975). Nitrogen metabolism in lichens, VI. The blue-green phycobiont content, heterocyst frequency and nitrogenase activity in Peltigera spp. New Phytol., 74, 473.
  • Hitch, C. J. B. & Stewart, W. D. P. (1973). Nitrogen fixation by lichens in Scotland. New Phytol., 72. 509.
  • Kershaw, K. A. & Millbank, J. W. (1969). A controlled environment lichen growth chamber. The Lichenologist, 4, 83.
  • Kulasooriya, S. A., Lang, N. J. & FAY, P. (1972). Heterocysts of blue-green algae III; Differentiation and nitrogenase activity. Proc. Roy. Soc. B., 181, 199.
  • Postgate, J. R. (1972). The acetylene reduction test for nitrogen fixation. in: Methods in Microbiology 6B. (Ed. by J. R.Norris & D. W.Ribbons), pp. 343356. Academic Press. London .