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Calcium oxalate hydrates on the surface of lichens

Published online by Cambridge University Press:  28 March 2007

T. Wadsten  and
R. Moberg
T. Wadsten
Affiliation:
Inorganic Chemistry, Arrhenius Laboratory, University of Stockholm, S-106 91 Stockholm, Sweden
R. Moberg
Affiliation:
Herbarium, University of Uppsala, P.O. Box 541, S-751 21 Uppsala, Sweden
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Abstract

The examination of the surface deposit of various lichens with X-ray diffraction methods, correlated with scanning electron microscopical (SEM) studies, have shown that calcium oxalate is present as two different hydrates; weddellite (CaC2O4-(2 + x)H2O), in three slightly different morphologies, and whewellite (CaC2O4H2O). The reason for the formation of calcium oxalate is not known and the presence of the various crystal forms is yet to be explained. However, the various hydrates may have some role in the water balance as they are different in dry and humid sites.

Type
Research Article
Information
The Lichenologist , Volume 17 , Issue 3 , October 1985 , pp. 239 - 245
Copyright
Copyright © British Lichen Society 1985

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