| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Helminthocladia australis | 11694 | | | ITIS | accepted | | Species |
| Helminthocladia californica | 11695 | | | ITIS | not accepted | synonym of Helminthocladia australis | Species |
| Helminthocladia calvadosii | 11696 | | | ITIS | accepted | | Species |
| Helminthocladia purpurea | 183027 | (Harvey) J. Agardh | | ITIS | accepted | | Species |
| Helminthocladia vermicularis | 11697 | (Agardh) Harvey | | ITIS | accepted | | Species |
| Mesogloia purpurea | 183028 | Harvey | | ITIS | not accepted | synonym of Helminthocladia purpurea | Species |
| Mesogloia vermicularis | 11698 | Agardh | | ITIS | not accepted | synonym of Helminthocladia vermicularis | Species |
