Outstanding contributions by Cummins include a study of the phylogenetic significance of the pores in rust urediniospores, a monograph of the genus Prospodium, an illustrated manual of rust genera,[REF] and studies of major groups of grass rusts, some cooperatively with H. C. Greene and J. F. Hennen (Baxter, 1962).
Cummins was also a talented scientific illustrator and J.C. Arthur's 1934 Manual of the Rust Fungi contains his illustrations.