| Collector | Ollgaard, B. |
| Number | 57070 |
| Collected with | Korning, J. & Thomsen, K. |
| Country | Ecuador |
| Subpart | NAPO |
| County | |
| Locality | Añangu, NW corner of the "Parque Nacional Yasuní". Along SEF line in terra firme forest, near Tiputini trail. Undisturbed rain forest. |
| Coordinates | 0° 32' S 76° 22' W |
| Minimum elevation (m) | 300 |
| Maximum elevation (m) | 300 |
| Start date | 1985/01/14 |
| End date | 1985/01/22 |
| Family | Thelypteridaceae |
| Identification | Thelypteris arcana (Maxon & Morton)Morton |
| Determined by | Tuomisto, H. (TUR), 1994. |
| Identification qualifier | |
| Field notes | At SEF point 128. Rhizome ascending, with ... erect leaves, the fertile one 1.5 times taller that the vegetative ones. In open tree fall area. |
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