. The Canadian field-naturalist. 198: Wagner and Johnson: Ebony Spleenwort. Great Lakes Area 157 r** 1965 1954 • . * 1953 1952 1959 • •_ ••^ 1967 • • • •• 19*0 • • •.•. Figure 1. The distribution of Ebony Spleenwort in the Great Lakes region. Dots represent records from the following sources: Illinois. Mohlenbrock(1967); Indiana, Deam(1940); Iowa, Cooperrider( 1959); Michigan, Billington( 1952); Minnesota, Tryon( 1954); Ohio, Adams( 1958); Ontario before 1965, A. A. Reznicek(personal communication 1980); and Wisconsin, Tryon et al. (1953). Stars indicate records since these respective dates su
. The Canadian field-naturalist. 198: Wagner and Johnson: Ebony Spleenwort. Great Lakes Area 157 r** 1965 1954 • . * 1953 1952 1959 • •_ ••^ 1967 • • • •• 19*0 • • •.•. Figure 1. The distribution of Ebony Spleenwort in the Great Lakes region. Dots represent records from the following sources: Illinois. Mohlenbrock(1967); Indiana, Deam(1940); Iowa, Cooperrider( 1959); Michigan, Billington( 1952); Minnesota, Tryon( 1954); Ohio, Adams( 1958); Ontario before 1965, A. A. Reznicek(personal communication 1980); and Wisconsin, Tryon et al. (1953). Stars indicate records since these respective dates supplied by individuals (see Acknowledgments), who examined specimens in herbaria in the state or province with which they are identified. Large stars serve to emphasize peripheral stations, and the irregular line through Iowa, Indiana, Illinois, Ohio, Pennsylvania, and New York represents the glacial boundary. The inset shows the entire range of the Ebony Spleenwort. plant can now barely be considered rare in ; Charles Sheviak of New York State Museum, Albany, (personal communication 1980) considered A. platy- neuron "now a common plant throughout Illinois," where Pepoon( 1927) called it "the rarest of our ferns" in the Chicago region. The best documented instance of increase in indi- vidual population size was provided by the work of Arthur J. Cooperof North Carolina State University, who found and mapped the localities of six plants at five sites in a 1958 study at The University of Michi- gan's Edwin S. George Reserve in Livingston County, Michigan. He was impressed that he never found more than one plant (except for two plants at one locality) at any one place, and therefore collected no vouchers to avoid eradicating any of the populations. He provided us, however, with a minutely detailed map of the 1958 localities which enabled us to revisit each site in 1979 and find out what had happened to the five populations
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