| Name | Microthamnium longirostrum Thériot | 
| Authorship | Thériot | 
| Rank | Species | 
| NomenclaturalStatus | NomLeg | 
| Placed in | Microthamnium | 
| Citation | 1926 Recueil Publ. Soc. Havraise Etudes Diverses 1925: 150 | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Microthamnium longirostrum Thériot | 
| Identification made in | [no date] (1) | 
