Robert H. Mohlenbrock is a Professor of Botany at Southern Illinois University and general editor of this series. The first volume of which entitled Ferns, was published in 1967. A Ph.D graduate of Washington University, he is foremost authority on the flora of Illinois. Along with his journals, his articles have been published in American Fern Journal, American Midland Naturalist, Quarterly Review of Biology, the Bulletin of the Missouri Botanical Garden, Rhodora, The Kew Bulletin, and the Bulletin of the Torrey Botanical Club. He is the coauthor with John W. Voigt of two books on the vegetation of Southern Illinois. A Flora of Southern Illinois and Plant Communities of Southern Illinois, both published by Southern Illinois University Press."