The Rust Fungi (Uredinales) on Compositae in Mexico

Abstract

There are 123 species and 15 varieties in 10 genera recorded, together with their host plants, collectors and states where collected. Four new species are described: Puccinia archibaccharidis on Archibaccharis hieracioides in Mexico and Guerrero State, P. mcovaughii on Archibaccharis sescenicepts in Guerrero State, P. stomatifera on Perezia nudicaulis in Chiapas State, and P. duranii on Eupatorium greggii in Durango State. This is the third of recent papers (Cummins 1967, Hennen and Cummins 1967) that bring the records of the Mexican rust fungi up to date. The nomenclature follows Cummins and Stevenson (1956) or Parmelee (1967, 1969), Hennen and Cummins (1969), and Cummins, Britton, and Baxter (1969). Our study is based on some 700 specimens in the Arthur Herbarium (PUR), Purdue University. Several have been from phanerogamic herbaria (ARIZ, F, MICH, MO, MSU, NY, US, SMU). We appreciate the cooperation of the curators. Abbreviations of herbaria follows Lanjouw and Stafleu (1964). In the later 1890's, E. W. D. Holway collected extensively in the southern half of Mexico and, until recently, knowledge of the Uredinales of Mexico largely resulted from his collections. About 280 of the specimens listed here are his. Between 1961 and the present, we have collected, especially in the Northern half of Mexico. Some 200 of the specimens listed are ours. All specimens are listed by PUR accession number. Exsiccati are listed in parenthesis. The names of host tribes are in parenthesis following each host genus. The life cycles of the species are indicated as follows: 1 Journal Paper No. 4140 of the Purdue University Agricultural Experiment Station. * Dow Quimica Mexicana, S.A. de C.V., Culiacan, Sinaloa.