1. Institute of Plant Science and Microbiology, Microalgae and Zygnematophyceae Collection Hamburg, Universität Hamburg, Germany
2. Present address: Małopolska Centre of Biotechnology, Jagiellonian University, Gronostajowa 7A, 30-387 Krakow, Poland
3. Present address: The Franciszek Górski Institute of Plant Physiology, Polish Academy of Science, Krakow 30–239, Poland