| Name | Isopterygium subalbescens Brotherus |
| Authorship | Brotherus |
| Rank | Species |
| Placed in | Isopterygium |
| Citation | 1899 Hedwigia 38: 231 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Isopterygium subalbescens Brotherus |
| Identification made in | [no date] (4) |
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