Abstract
Biological crusts are composed of algae, cyanobacteria, bacteria, micro-fungi and lichens, sometimes also mosses. Only in rare cases are all components involved in crust formation, quite often there is only one or two of these groups involved. Biological crusts occur on rock and soil surfaces and on the bark of trees, on leaves, but also on man-made substrates. This review focuses on the two main terrestrial habitats — soil and rock — where biological crusts are predominantly found in semiarid and arid regions or under arid microclimatic conditions in all climatic ecoregions on Earth.
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Büdel, B. (2002). Diversity and Ecology of Biological Crusts. In: Esser, K., Lüttge, U., Beyschlag, W., Hellwig, F. (eds) Progress in Botany. Progress in Botany, vol 63. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56276-1_16
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