You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Ironto Shale Barrens, on Roanoke Road, 1 mi. E. of Ironto Remove constraint Place: Ironto Shale Barrens, on Roanoke Road, 1 mi. E. of Ironto Place Virginia Remove constraint Place: Virginia Topic Polypodiales Remove constraint Topic: Polypodiales