| Name | Atractylocarpus costaricensis (Müller Halle) R. S. Williams |
| Authorship | (Müller Halle) R. S. Williams |
| Rank | Species |
| Placed in | Atractylocarpus |
| Citation | 1928 Bryologist 31: 110 |
| Holdings | 16 Specimens held in the Harvard University Herbaria identified as Atractylocarpus costaricensis (Müller Halle) R. S. Williams |
| Identification made in | [no date] (16) |