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Cooperations
- lichens of Germany (Prof. Dr. V. Wirth, Murr & Prof. Dr. M. Hauck, Göttingen; book project)
- phylogeny of cyanolichens (Prof. Dr. B. Büdel, Jun.-Prof. F. Kauff; TU Kaiserslautern)
- freshwater lichens of Central Europe (Dr. H. Thüs, London; book project, published December 2008)
- lichens of the City of Hamburg (cooperation with the Behörde für Stadtentwicklung und Umwelt der Stadt Hamburg and Dr. T. Feuerer)
- the Lecanora dispersa-group in northern Germany (Dr. T. Feuerer, Dr. C. Dolnik, Dr. U. Schiefelbein)
- Red List of endangered lichen species of Germany (coordination: Prof. Dr. V. Wirth; supported by Federal Agency for Nature Cornservation; book project finished 2011)
- lichens of Yosemite National Park, California (coordination: Prof. B. McCune; Oregon State University, Corvallis, M. Hutten,Yosemite National Park Service)
- lichens of Katmai and Lake Clark National Parks, Alaska (Prof. B. McCune; Oregon State University, Corvallis)
- digitization of plant types of the Herbarium Hamburgense, Global Plants Initiative (Dr. H.-H. Poppendieck, Herbarium Hamburgense, JSTOR Plant Science Unterstützung: Mellon-Foundation)
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Research stays abroad
- Namibia (2005, 2006)
- United Arab Emirates and Oman (2004)
- W North America: Arizona, New Mexico, Texas, California, Nevada, Baja California, Oregon (1999, 2002, 2003, 2008, 2009)
- Yemen and Socotra (1997, 2001, 2002)
- Spain (2000)
- Kuwait (1998)
- Karelia, Russia (1996, 1997)
- Venezuela (1996)
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Memberships in scientific societies
- International Association for Lichenology (IAL)
- British Lichen Society (BLS)
- American Bryological and Lichenological Society (ABLS)
- International Association for Plant Taxonomy (IAPT) Weblink
- Bryologisch-Lichenologische Arbeitsgemeinschaft für Mitteleuropa (BLAM)
- Botanischer Verein zu Hamburg e.V.
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Teaching
- Lecture Biodiversity of Plants, Part Fungi
- Botancal excursions
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