Clausen, R.T. 1938: Ophioglossum petiolatum Hooker. American Fern Journal 28: 1–10.
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| Clausen, R.T. 1938: Ophioglossum petiolatum Hooker. American Fern Journal 28: 1–10. |
| Clausen, R.T. 1938: Ophioglossum petiolatum Hooker. American Fern Journal 28: 1–10. |