| Name | Heteroscyphus planiusculus (Hooker f. & Taylor) J. J. Engel |
| Authorship | (Hooker f. & Taylor) J. J. Engel |
| Rank | Species |
| Placed in | Heteroscyphus |
| Citation | 1990 J. Hattori Bot. Lab. 68: 315 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Heteroscyphus planiusculus (Hooker f. & Taylor) J. J. Engel |
| Identification made in | 2016 (2) |