You searched for: Institution University of Michigan. Libraries Remove constraint Institution: University of Michigan. Libraries Place Mexico Remove constraint Place: Mexico Place Road to Calvillo, 21 miles west of Aguascalientes Remove constraint Place: Road to Calvillo, 21 miles west of Aguascalientes Topic Cheilanthes Remove constraint Topic: Cheilanthes Topic Polypodiales Remove constraint Topic: Polypodiales Type still image Remove constraint Type: still image