Observations on Certain Species of Ustilago on Hilaria, Stenotaphrum, And Muhlenbergia

1 Investigations of the smut diseases of grasses, co6perative between the Division of Forage Crops and Diseases, Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research Administration, U. S. Department of Agriculture, and the Washington Agricultural Experiment Station, Pullman, Washington. Published as Scientific Paper No. 600, College of Agriculture and Agricultural Experiment Station, State College of Washington. 2 Pathologist, Division of Forage Crops and Diseases, Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research Administration, United States Department of Agriculture, and Assistant in Plant Pathology, State College of Washington, respectively.