1. School of Biological Sciences; Victoria University of Wellington; PO Box 600 Wellington 6140 New Zealand
2. Botanic Garden Meise; Nieuwelaan 38 1860 Meise Belgium
3. Phycology Research Group; Biology Department; Ghent University; Krijgslaan 281 S8 9000 Ghent Belgium
4. Limnological Institute of the Russian Academy of Sciences; Ulan-Batorskaya 3 664033 Irkutsk Russia
5. Papanin Institute for Biology of Inland Waters of the Russian Academy of Sciences; 152742 Borok Yaroslavl Russia