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2. Birks, H.J.B. (1973). Past and Present Vegetation of the Isle of Skye-a Palaeoecological Study. Cambridge University Press, London.
3. Braithwaite, R. (1887-1905). The British Moss Flora. London.
4. Clapham, A.R., Tutin, T.G. & Warburg, E.F. (1962). Flora of the British Isles, ed. 2. Cambridge University Press, London.