Cover illustration: The cover inset shows three species of peat moss (Sphagnum) co-occurring on a bog hummock. In bogs, different Sphagnum species occupy different microtopographical niches characterized by height above the water table. Differences in water availability influence water relationship parameters of the mosses and their physiological tolerance to desiccation. See Hájek and Beckett (pp. 165-173).
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