A study of certain Mexican and Guatemalan species of Polypodium A study of certain Mexican and Guatemalan species of v. 8No. 31–5, 271-279Maxon, William R. 1903. "A study of certain Mexican and Guatemalan species of Polypodium." Contributions from the United States National Herbarium, 8, (3) 1–5, 271-279.More...ID: 124929Type: articleKeywords: USNM; NMNH