1. Universität Göttingen; Experimentelle Phykologie und Sammlung von Algenkulturen (SAG); Nikolausberger Weg 18 Göttingen 37073 Germany
2. Department of Biology; John Carroll University; University Heights Ohio 44118 USA
3. Department of Botany; Faculty of Science; University of South Bohemia; Branišovská 31 České Budějovice 370 05 Czech Republic