- Haslea trompii (Cleve) Simonsen, 1974 accepted as Navicula trompii var. trompii Cleve, 1900
- Navicula directa (W.Smith) Ralfs, 1861 accepted as Pinnularia directa var. directa W. Smith, 1853
- Navicula trompii Cleve, 1901 accepted as Haslea trompii (Cleve) Simonsen, 1974 accepted as Navicula trompii var. trompii Cleve, 1900
- Navicula trompii var. trompii Cleve, 1900 (uncertain > unassessed)
- Pinnularia directa W.Smith, 1853 accepted as Navicula directa (W.Smith) Ralfs, 1861 accepted as Pinnularia directa var. directa W. Smith, 1853
- Pinnularia directa var. directa W. Smith, 1853 (uncertain > unassessed)
- Pleurosigma directum Grunow, 1880