| Type | Article |
| Authors(s) | Schneider H, Kreier HP, Wilson, E, Smith AR. |
| Year | 2006 |
| Title | The Synammia enigma: evidence for a temperate lineage of polygrammoid ferns (Polypodiaceae, Polypodiidae) in Southern South America. |
| Periodical | Systematic Botany |
| Volume | 31 |
| Page(s) | 31–41 |