Rusts from British Honduras was published by the University of Michigan Press in 1939. This volume provides detailed investigations into the flora of the El Cayo District of British Honduras. Mains' research, part of a cooperative study with the Carnegie Institution of Washington, identifies and describes fifty-eight species of rusts. His work emphasizes the regional distribution of these species, which often extend from the West Indies through Central and South America. Smith's work, based on Mains' 1936 agaric collections, identifies twenty-three species distributed across twelve genera, including one new species, Mycena hondurensis. Smith’s meticulous descriptions and comparisons with existing specimens illustrate the rich fungal biodiversity of British Honduras. This publication offers valuable insights into the cryptogamic flora of the region and serves as an important reference for mycologists and botanists studying tropical American fungi.