Uredinales Parasitizing Grasses of the Tribe Chlorideae

A taxonomic account of the 27 species of rusts (Uredinales) parasitizing grasses of the tribe Chlorideae throughout the world is presented in this paper. Only Puccinia and Uromyces of the six genera of rusts known to occur on grasses parasitize species of the Chlorideae. The Chlorideae and their rusts are generally tropical or subtropical in distri? bution. However, the distribution of a particular rust usually is not as great as that of its host or hosts. Some rust species are endemic to small areas although their hosts grow over wide areas, i.e. Puccinia kansensis, while other species are cosmopolitan with their hosts, i.e. Puccinia cynodontis. Out of a total of 27 species, 17 occur in North America, 14 in South America, and 9 in Africa. Two species are known in Europe, three in Asia, and two in Australia. The Sydow's monograph (20, 22) is the only previous treatment of this group on a world-wide basis. This work included 14 of the present 27 species. Publications limited geographically have included several of the presently recognized species. Arthur (3) included 13 of the species of Puccinia in the genus Dicaeoma and four of the species of