You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Mexico Remove constraint Place: Mexico Place Oaxaca Remove constraint Place: Oaxaca Place Vicinity of Zacatepec. Along trail north of cite for ca. 1 mile. Remove constraint Place: Vicinity of Zacatepec. Along trail north of cite for ca. 1 mile. Topic Selaginella Remove constraint Topic: Selaginella Type still image Remove constraint Type: still image