1. Department of Biological Sciences; University of Arkansas; Fayetteville AR USA
2. Prairie Research Institute; Illinois Natural History Survey; University of Illinois Urbana-Champaign; Champaign IL USA
3. Forest Preserve District of DuPage County; Wheaton IL USA
4. Forest Preserve District of Cook County; River Forest IL USA
5. Forest Preserve District of Will County (Retired); Joliet IL USA
6. Illinois Department of Natural Resources; Silver Springs State Park; Yorkville IL USA
7. Lake County Forest Preserves; Libertyville IL USA