| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Antithamnion baylesiae | 13165 | | | ITIS | not accepted | synonym of Hollenbergia subulata | Species |
| Antithamnion densiusculum | 13164 | | | ITIS | not accepted | synonym of Hollenbergia subulata | Species |
| Antithamnion nigricans | 13167 | | | ITIS | not accepted | synonym of Hollenbergia nigricans | Species |
| Antithamnion subulatum | 13162 | | | ITIS | not accepted | synonym of Hollenbergia subulata | Species |
| Callithamnion subulata | 13163 | Harvey | | ITIS | not accepted | synonym of Hollenbergia subulata | Species |
| Hollenbergia nigricans | 13166 | | | ITIS | accepted | | Species |
| Hollenbergia subulata | 13161 | | | ITIS | accepted | | Species |
