| Name | Ectropothecium arnense Brotherus |
| Authorship | Brotherus |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Ectropothecium |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Ectropothecium arnense Brotherus |
| Identification made in | [no date] (1) |