1. Museo Tridentino di Scienze Naturali, Limnology and Phycology Section, Via Calepina 14, I‐38100 Trento, Italy
2. Botany Institute, University of Frankfurt, Siesmayerstraße 70, D‐60323 Frankfurt/M., and Senckenberg Research Institute, Senckenberganlage 31‐33, D‐60054 Frankfurt/M., Germany