You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Language UND Remove constraint Language: UND Place Michigan Remove constraint Place: Michigan Place Sturgeon River, near Upper Falls; Covington, ca 6.5 mi NE of Remove constraint Place: Sturgeon River, near Upper Falls; Covington, ca 6.5 mi NE of Topic Polypodiales Remove constraint Topic: Polypodiales Topic Polypodiopsida Remove constraint Topic: Polypodiopsida Topic Woodsia Remove constraint Topic: Woodsia