| Name | Microthamnium laxulum E. B. Bartram |
| Authorship | E. B. Bartram |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Microthamnium |
| Citation | 1928 Contr. U.S. Natl. Herb. 26: 113 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Microthamnium laxulum E. B. Bartram |
| Identification made in | [no date] (3), 2014 (1) |