You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Oaxaca Remove constraint Place: Oaxaca Place Valley of the Yelagago River, ca. 20 mi. n.e. of Villa Alta. From Hallberg ranch down to Yelagago River. Remove constraint Place: Valley of the Yelagago River, ca. 20 mi. n.e. of Villa Alta. From Hallberg ranch down to Yelagago River. Topic Hymenophyllum Remove constraint Topic: Hymenophyllum Topic Polypodiopsida Remove constraint Topic: Polypodiopsida Type still image Remove constraint Type: still image