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Water Relations in Living, Dead, and Cellulose Models of the Lichen Umbilicaria papulosa

Ray E. Showman and Emanuel D. Rudolph
The Bryologist
Vol. 74, No. 4 (Winter, 1971), pp. 444-450
DOI: 10.2307/3241303
Stable URL: http://www.jstor.org/stable/3241303
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Water Relations in Living, Dead, and Cellulose Models of the Lichen Umbilicaria papulosa
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Abstract

Water relations of living lichens, dead lichens, and cellulose model lichens were studied at different relative humidities. An air flow system allowed instantaneous weight measurement while water uptake or loss was occurring. In all cases, living lichens had the greatest uptake rates, followed by dead lichens and cellulose models. Nonaqueous staining techniques showed that in living, but not in dead lichens, most of the water is held in the algal layer. The processes of water vapor uptake and water loss are apparently physical, and the differences in rates can be explained by differences in the physical properties of the test materials.

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