ADIANTUM IN NICARAGUA Frank C. Seymour-'^ In preparing this article, much help has been derived from Miss Edith Scamman's treatment of the "Maidenhair Ferns of Costa Rica". In addition to the text, her drawings portray characters not otherwise shows. Since that article -was published, much collecting has been accomplish-ed in Nicaragua and in other parts of Central America. It seems appropriate therefore to bring the subject up to date and to include not only Nicaragua but all of Central America to prepare the way for the discovery in Nicaragua of species not yet known there. Descriptions of some of these species are difficult to find and specimens of some are scarce or difficult of access. To make information more readily available is the purpose of writing. The first part of this treatment is an analytical key for all the species know^n to occur in Central America. It is followed by an alphabetic list of the same species with fur-ther information. Such synonomy is given as it has been ne-cessary to deal with. In addition to a bibliography and index at the end, numerous references are given to assist the reader to pursue the subject further if desired. So far as I have been able to ascertain from specimens examined, 19 of the 34 species in Central America occur in Nicaragua. I express my thanks to the following persons and their staffs for the privilege fo examining specimens and using the facilities cf their respective herbaria. Dr. Reed C. Rollins, Director of the Gray herbarium. Dr. Richard A. How^ard, Di-rector of the Arnold Arboretiom. Dr. David B. Lellinger, Pteridologist of the United States National Herbarium. Dr, Daniel B. Ward, Director of the Herbarium of the University of Florida. Dr. Hximberto Tapia B. , Director of the Herbarium of the Escuela Nacional de Agricultura y Ganaderia of Nicar-agua. Dr. H. W. Vogelmann, Director of the R-ingle Herbarium ^Research Associate, Missouri Botanical Garden, and Visiting Associate Research Professor, University of Florida.