Figure Legend
Figure 1. Signs and symptoms of Phyllachora spp . on grasses. P. maydis on maize at severe levels (A); with ascospores being extruded from stroma (B) and showing characteristic tapering ends of mature stromata (C). Phyllachora spp . on Elymus in Michigan (D), Fall Ryegrass in Illinois \euro, and an unidentified grass in Indiana (F). Photo credit N. Kleczewski
Figure 2 . Maximum likelihood phylogenetic tree based on combined ITS and LSU sequence data from the stroma of 76Phyllachora isolates from herbarium and contemporary samples of infected maize and other grass hosts. Exserohilum turcicum was used as the outgroup.
Figure 3. Maximum likelihood phylogenetic tree based on ITS sequence data from geographically representative isolates of the 5 genetic groups of maize and grass infecting Phyllachora from this study and Phyllachora species available from GenBank. Specimens highlighted in blue a contemporary isolates collect after 2015 and those highlighted in orange are herbarium samples collected between 1905-1977.
Suppl. Figure 1 . Maximum likelihood phylogenetic tree based on the ITS sequence data from the stroma of 169 Phyllachora isolates from herbarium and contemporary samples of infected maize and other grass hosts. Exserohilum turcicum was used as the outgroup.
Data Accessibility Statement. All DNA sequence data generated by this project were deposited in Genbank as accessions OL314402-OL314494 and OL342781-OL342949.
Acknowledgements . This research was supported in part by the U.S. Department of Agriculture, Agricultural Research Service. FFAR-ROAR grant to NK, CC, DT, MC, and DS with matching funds from Pioneer, The National Corn Growers Association, The Illinois Corn Growers Improvement Board, and Purdue University. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.