| Name | Plagiochila longissima Colenso |
| Authorship | Colenso |
| Rank | Species |
| Placed in | Plagiochila |
| Citation | 1889 Trans. & Proc. New Zealand Inst. 21: 49 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Plagiochila longissima Colenso |
| Identification made in | [no date] (2) |