You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Mexico Remove constraint Place: Mexico Place North slope of Cerro Zempoaltepetl. Trail from Totontepec to La Candelaria. Remove constraint Place: North slope of Cerro Zempoaltepetl. Trail from Totontepec to La Candelaria. Place Oaxaca Remove constraint Place: Oaxaca Topic Equisetales Remove constraint Topic: Equisetales Topic Polypodiopsida Remove constraint Topic: Polypodiopsida