| Collector | Christensen, H. M. |
| Number | 1317 |
| Collected with | |
| Country | Malaysia |
| Subpart | SARAWAK |
| County | |
| Locality | 2nd division, Ulu Ai, Lubok Antu District. Swampy open area in the vicinity of Nanga Sumpa |
| Coordinates | 1° 20' N 112° 10' E |
| Minimum elevation (m) | 150 |
| Maximum elevation (m) | 150 |
| Start date | 1993/07/06 |
| End date | 1993/07/06 |
| Family | Thelypteridaceae |
| Identification | Sphaerostephanos unitus (L.) Holttum |
| Determined by | Edwards, P. J. |
| Identification qualifier | |
| Field notes | Uses: Young fronds are eaten as vegetable. Name in Iban language: Paku Keras. |
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