T. V. Callaghan, N. J. Collins, C. H. Callaghan, Photosynthesis, Growth and Reproduction of Hylocomium splendens and Polytrichum commune in Swedish Lapland. Strategies of Growth and Population Dynamics of Tundra Plants 4, Oikos, Vol. 31, No. 1 (1978), pp. 73-88
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Callaghan et al. (1978) studied this question.
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