| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Fragilaria bicapitata | 2999 | Mayer | | ITIS | not accepted | synonym of Fragilariforma bicapitata | Species |
| Fragilaria constricta | 2979 | Ehrenb. | | ITIS | not accepted | synonym of Fragilariforma constricta | Species |
| Fragilaria constricta var. constricta | 2980 | Ehrenb. | | ITIS | not accepted | synonym of Fragilariforma constricta | Variety |
| Fragilaria virescens | 2967 | Ralfs | | ITIS | not accepted | synonym of Fragilariforma virescens | Species |
| Fragilaria virescens var. virescens | 2968 | Ralfs | | ITIS | not accepted | synonym of Fragilariforma virescens | Variety |
| Fragilariforma bicapitata | 591231 | (Mayer) D. M. Williams & Round | | ITIS | accepted | | Species |
| Fragilariforma constricta | 591249 | (Ehrenb.) D. M. Williams & Round | | ITIS | accepted | | Species |
| Fragilariforma virescens | 591250 | (Ralfs) D. M. Williams & Round | | ITIS | accepted | | Species |
