| Name | Nitzschia obtusa W. Smith | 
| Authorship | W. Smith ter | 
| Rank | Species | 
| Placed in | Nitzschia Hassall | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Nitzschia obtusa W. Smith | 
| Identification made in | [no date] (1) | 
| Name | Nitzschia obtusa W. Smith | 
| Authorship | W. Smith ter | 
| Rank | Species | 
| Placed in | Nitzschia Hassall | 
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Nitzschia obtusa W. Smith | 
| Identification made in | [no date] (1) |