1. Dipartimento di Botanica dell'Università di CataniaVia A. Longo 19I‐95125CataniaItaly
2. Laboratoire de Phycologie Marine et de Morphogenèse CNRS et GPPMAAvenue Olivier MessiaenF‐72017Le MansFrance
3. University of OsloDepartment of Biology, Section of Marine BotanyP. O. Box 1069 BlindemN‐0316OsloNorway