You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Language UND Remove constraint Language: UND Place Depto. Petoroa. Cerro Chache, 5 hours by horse southeast of Patagua Mine, ca. 18km east of La Ligua. Remove constraint Place: Depto. Petoroa. Cerro Chache, 5 hours by horse southeast of Patagua Mine, ca. 18km east of La Ligua. Place South America Remove constraint Place: South America Topic Equisetum Remove constraint Topic: Equisetum Topic Polypodiopsida Remove constraint Topic: Polypodiopsida Type still image Remove constraint Type: still image