| Name | Plagiochasma elongatum Lindenberg & Gottsche |
| Authorship | Lindenberg & Gottsche |
| Rank | Species |
| Placed in | Plagiochasma |
| Citation | 1846 Syn. Hepat. 519 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Plagiochasma elongatum Lindenberg & Gottsche |
| Identification made in | [no date] (3) |