You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Language UND Remove constraint Language: UND Place Greenstone Ridge, within 2 mi of Windigo; Isle Royale National Park Remove constraint Place: Greenstone Ridge, within 2 mi of Windigo; Isle Royale National Park Place Michigan Remove constraint Place: Michigan Topic Ophioglossaceae Remove constraint Topic: Ophioglossaceae Topic Polypodiopsida Remove constraint Topic: Polypodiopsida Topic Sceptridium Remove constraint Topic: Sceptridium Type still image Remove constraint Type: still image