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Marchantiidae treats 103 species in two orders: Marchantiales and Monocleales. Marchantiales are represented in the neotropics by 102 species, in 18 genera, and include 11 families. Monocleales are represented in the neotropics by a single species.
Stefan Robbert Gradstein (1943 - ) is a Dutch botanist with a special interest in tropical America and Indonesia. Gradstein's research focus is the systematics and ecology of cryptogamic plants, especially liverworts. He is (known as Rob, and atttended the University of Utrecht, where he obtained a PhD in botany in 1975. Missouri Botanical Garden awarded him the Jesse M. Greenman Award for his doctoral dissertation, A taxonomic monograph of the genus Acrolejeunea (Hepaticae). He has held positions as lecturer and curator of cryptogams at the University of Utrecht (1969-1995), as a graduate research assistant at the University of Cincinnati (1970-1971), a Fullbright fellow at the University of Colorado (1976), and as professor of tropical botany at the University of Michigan (1986-1987). In 1995 he was appointed professor of botany and director of the herbarium and botanical garden of the University of G”ttingen; he retired from G”ttingen in 2009. He has carried out extensive fieldwork in South America and Indonesia, collecting more than 15,000 numbers as well as directing research projects and teaching. He has authored almost 350 research papers and several books, including the Guide to the Bryophytes of Tropical America (2001), co-authored with S.P. Churchill (Missouri Botanical Garden) and N. Salazar Allen (Smithsonian Tropical Research Institute). Gradstein is editor-in-chief of the journal Taxon and a founding member and past president of the International Association of Bryologists. He has been an editor of Flora Neotropica and deputy director of the Organization for Flora Neotropica for almost 20 years. A member of the Academy of Sciences of G”ttingen, he was awarded the Candolle Prize of the Societ‚ de Physique et d'Histoire Naturelle de GenŠve in 1994. More than 20 taxa are named in his honor, including the Colombian moss genus Gradsteinia Ochyra. He is also a skilled cellist and has performed in many concerts in the Netherlands, Germany and France. Stephan Robbert Gradstein's Author Page
Helene Bischler-Causse (1932-2005) was born in Switzerland in 1932. She attended the University of Geneva, where she obtained a Ph.D. in natural sciences in 1957. She has held research positions at the Universidad Nacional, Bogota (Colombia), during 1956-1959, at the Conservatoire Botanique, Geneve, during 1960-61, and at the Centre National de la Recherche Scientifique (C.N.R.S.), Paris, from 1961 onward, where she was appointed to several research teams (liverworts of the Neotropics, liverworts of the Mediterranean area, evolution of cryptogams, biodiversity, and molecular systematics). Dr. Bischler's research interest was first systematics of neotropical liverworts, then ecology of Mediterranean liverworts, then systematics and evolution of the liverwort subclass Marchantiidae. She did extensive fieldwork in Colombia and in the Mediterranean, and contributed to many floras. She introduced many research students from all over the world to liverwort studies and was the editor of the scientific periodical Cryptogamie, Bryologie-Lich6nologie for more than 30 years. She is a co-author of several volumes of Index Hepaticarum and published more than 120 scientific research papers and several books, including taxonomic monographs of the general Marchantia and Plagiochasma, and a summary on systematics and evolution of the genera of the Marchantiales. For her research, Dr. Bischler was awarded the prize Plantamour-Prevost of the Universite de Geneve in 1953, the P. Bertrand prize of the Academie des Sciences, Paris in 1974, the Geneva Sayre award of Harvard University in 1985, and the Hattori Prize of the International Association of Bryologists in 1995. Helene Bischler-Causse passed away on February 12th, 2005. Helene Bischler-Causse's Author Page
Noris Salazar Allen M.A., Ph.D. Part-time Scientific Staff. Research Professor "ad honorem", Department of Botany, University of Panama, Curator of Bryophytes and Lichens, Herbarium, University of Panama. Biosystematics of tropical bryophytes and lichens of Panama. I am currently working on the biosystematics of Neotropical species of the moss Octoblepharum, the thalloid liverwort Dumortiera (worldwide) and the horwort Notothylas in Panama and Central America. The work includes revision of fresh and herbarium collections, developmental morphology of protonema and adult gametophyte, fungal endophyte associations, bioactivity of liverworts and fungal compounds, ecology and community associations of these bryophytes. I have a stock of fungal endophytes isolated from Dumortiera that awaits identification by molecular techniques. I am also working on the bryophyte diversity of the Isthmus Panama in relation to the types of forests and the evolution of these communities through time by monitoring (starting 2012) bryophyte communities in selected areas. Research with lichens is done in association with Dr. Robert Lcking of the Field Museum of Natural History, Chicago, USA. It focuses on species diversity and association of communities. I have two B.A. student currently working on the morphology and distribution of Notothylas and Dumortiera of Panama respectively. I have being advisor to master and doctoral students from the University of Panama, and universities of South America (Colombia, Argentina) and Europe (England, Germany). Noris Salazar Allen's Author Page