| Name | Isopterygiopsis muelleriana (Schimper) Z. Iwatsuki |
| Authorship | (Schimper) Z. Iwatsuki |
| Rank | Species |
| Placed in | Isopterygiopsis |
| Citation | 1970 J. Hattori Bot. Lab. 33: 379 |
| Holdings | 40 Specimens held in the Harvard University Herbaria identified as Isopterygiopsis muelleriana (Schimper) Z. Iwatsuki |
| Identification made in | [no date] (39), 2016 (1) |