| 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) |