Lichens capture water via ice nucleation, absorbing the moisture once the temperature rises and the ice melts.

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"Ice nucleation activity at temperatures warmer than -5°C may enhance the uptake of atmospheric moisture by enhancing condensation and/or causing deposition of ice from water vapor to occur earlier as the temperature drops below 0°C. Once an ice lattice is formed, further deposition occurs more readily. When the temperature rises, the lichen thallus may then absorb moisture from the melting ice." (Kieft 1988:1680)

Journal article
The sepsis syndrome in a Dutch university hospital. Clinical observationsArchives of Internal MedicineMarch 18, 2003
H. Kieft

Journal article
Ice nucleating activity in lichens.Kieft, T.L.

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Golden Rimmed Navel LichenRhizoplacaSpecies

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