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Occurrence and Ecology of Usnea Longissima in Central Sweden

Published online by Cambridge University Press:  28 March 2007

P.-A. Esseen ,
L. Ericson ,
H. Lindström  and
O. Zackrisson
P.-A. Esseen
Affiliation:
Department of Ecological Botany, University of Umeå, S-901 87 Umeå, Sweden.
L. Ericson
Affiliation:
Department of Ecological Botany, University of Umeå, S-901 87 Umeå, Sweden.
H. Lindström
Affiliation:
Department of Ecological Botany, University of Umeå, S-901 87 Umeå, Sweden.
O. Zackrisson
Affiliation:
Department of Forest Site Research, The Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden.
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Abstract

The past and present occurrence of Usnea longissima has been investigated at 31 localities in an area of eastern central Sweden. A marked decline was found which is due to different forestry practices, and, to a minor extent, air pollution. The species is confined to old spruce forests, mainly located on north-facing slopes with a slightly oceanic climate. The population size showed a large variation both within and between seven investigated localities. Specific habitat demands and low dispersal ability make U. longissima very sensitive to environmental disturbances.

Type
Research Article
Information
The Lichenologist , Volume 13 , Issue 2 , June 1981 , pp. 177 - 190
Copyright
Copyright © British Lichen Society 1981

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