a French botanist-pteridologist specializing in the study of pteridophytes in France, Europe, and the Guianas.
Spent 24 years working in French Guiana.
The author/co-author of nearly 150 publications on the pteridophytes of France and the Guianas, and co-author of several books (including: Ecological Atlas of Ferns and Allied Plants, 1990; Guide to Ferns and Allied Plants of France and Western Europe, 2002; Ferns and Allied Plants of Europe, 2021)
His name is associated, as an author, with the description of several hybrid taxa from Europe, Juan Fernandez (Chile), and, most importantly, several new species for the Guianas. He also participates in the revision of the taxonomic reference works for pteridophytes in France and the Guianas.
He is a member of the Botanical Society of France (SBF) and several other French and international botanical societies, and has been a corresponding member of the National Museum of Natural History in Paris since 2023.
Awarded the Gandoger Prize for Cryptogamy in 2003 by the Botanical Society of France (SBF)
American botanist, evolutionary biologist.
1969 received BA in biology from University of Virginia (USA).
1969-1976 he taught middle school science and mathematics at various schools in Virginia (USA)
1973 received a MA in Secondary Education and another MA in biology in 1978 from the University of Virginia (USA). Received PhD in botany from Miami University (USA) in 1983. His PhD invovled the genetics of "Appalachian Asplenium complex."
Following his PhD, Werth went to teach at the University of Kansas. 1987 appointed associate professor and curator of RL Reed Herbarium in Biological Sciences at Texas Tech University.