This collection consists mainly of letters from Charles C. Deam (1865–1953), an expert on the trees, ferns and flowering plants of Indiana; he was for many years the state forester there. The letters concern Deam’s work on Juncus Linnaeus, his Flora of Indiana (Indianapolis, 1940), and other topics. There is at least one copy of a letter from Hermann, some lists of Hermann’s plants (determined by Deam?) and related items.