| Name | Macromitrium pycnophyllum Cardot |
| Authorship | Cardot |
| Rank | Species |
| Placed in | Macromitrium |
| Citation | 1910 Rev. Bryol. 37: 13 |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Macromitrium pycnophyllum Cardot |
| Identification made in | [no date] (6) |
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