| Name | Callicostella merkelii (Hornschuch) Jaeger |
| Authorship | (Hornschuch) Jaeger |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Callicostella |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Callicostella merkelii (Hornschuch) Jaeger |
| Identification made in | 2007 (3) |