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Vagn Alstrup,
Department of plant ecology
University of Copenhagen
Øster Farimagsgade 2D
DK-1353 Copenhagen K
Denmark.
Steen N. Christensen and Eric Steen Hansen
Botanical Museum
University of Copenhagen
Gothersgade 130
DK-1123 Copenhagen K
Denmark.
Svanhildur Svane
Botanisk Institut
Aarhus University
Nordlandsvej 68
DK-8240 Risskov
Denmark.