Abstract
SummaryLoss of viability by seven species of bryophyte (Anomodon viticulosus, Racomitrium aquaticum, R. lanuginosum, Tortula intermedia, Andreaea rothii, Frullania tamarisci and Porella platyphylla) kept dry at temperatures between 20 and 100 °C was followed by estimating chlorophyll content after a moist recovery period. Behaviour at different temperatures was qualitatively similar, differing in time‐scale. This ranged from a few minutes or less for 50% loss of chlorophyll at 100 °C to weeks or months for the more resistant species at 37 and 20 °C.For most of the species investigated, the logarithms of the half‐viability times gave straight lines when plotted against the reciprocal of absolute temperature, with little variation of slope between species. The relation is similar to that shown by dry seeds and extrapolation suggests half‐viability times of many years for the more desiccation‐tolerant bryophytes at 0 °C or below. The two Racomitrium species showed curvilinear relationships, with notably great tolerance at temperatures in the middle part of the range investigated.
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