United States, Michigan, Alpena, No named locality for Catalog Number 1100573
Epipetric in sun (shorter lvs) or growing through talus in partial shade (longer lvs). Longer-leaved plants grow toward bottom of sinkhole intimately with C. bulbifera. With Gymnocarpium dryopteris and Botrychium lunaria (forma onodeagense). D. marginalis nearby. Under mostly Thuja on Alpena Limestone.