You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Ontonagon Remove constraint Place: Ontonagon Place Porcupine Mts. St. Park, W. of the Lake of Clouds, T51N, R43W, Sec. 21. Remove constraint Place: Porcupine Mts. St. Park, W. of the Lake of Clouds, T51N, R43W, Sec. 21. Place USA Remove constraint Place: USA Topic Dryopteridaceae Remove constraint Topic: Dryopteridaceae Topic Dryopteris Remove constraint Topic: Dryopteris Topic Polypodiales Remove constraint Topic: Polypodiales Topic Polypodiopsida Remove constraint Topic: Polypodiopsida