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Rust fungi causing galls, witches' brooms, and other abnormal plant growths in northwestern Argentina

     Systematic Botany and Mycology Laboratory, U.S.D.A. Agricultural Research Service, 10300 Baltimore Blvd., Beltsville, Maryland 20705-2350

Joe F. Hennen

     Botanical Research Institute of Texas, 509 Pecan Street, Fort Worth, Texas 76102-4060

Conspicuous galls and witches' brooms frequently are symptoms of rust infections on plant hosts in the ecologically diverse northwestern region of Argentina. These symptoms are caused by systemic or locally systemic spermogonial-aecial infections, although uredinial and telial infections also might be involved. Sixteen species of rust fungi are treated in this paper, most of which cause a plant response that results in enlarged growth. Ypsilospora tucumanensis J.R. Hern. & J.F. Hennen on Inga edulis is described as a species new to science. Puccinia cordiae Arthur is cited as a new record for Argentina. These rusts also are included: Chaconia ingae, Gerwasia imperialis, Kuehneola loeseneriana, Prospodium appendiculatum, Prospodium elegans, Prospodium perornatum, Puccinia bougainvilleae, Puccinia pampeana, Ravenelia argentinica, Ravenelia hieronymi, Ravenelia papillosa, Ravenelia spegazziniana, Uromyces cestri and Uropyxis rickiana. For some of the scientific names, lectotype specimens have been designated.

Key words: morphology, nomenclature, South America, Uredinales, Ypsilospora