| Scientific Name | TSN | Taxon Author | Common Name | Name Source | Usage | Reason (ITIS) | Taxon Rank |
|---|
| Antithamnion breviramosus | 13138 | | | ITIS | not accepted | synonym of Antithamnionella breviramosa | Species |
| Antithamnion glanduliferum | 13130 | | | ITIS | not accepted | synonym of Antithamnionella glandulifera | Species |
| Antithamnion pacificum | 13133 | | | ITIS | not accepted | synonym of Antithamnionella pacifica | Species |
| Antithamnion scrippsiana | 13131 | | | ITIS | not accepted | synonym of Antithamnionella glandulifera | Species |
| Antithamnionella breviramosa | 13137 | | | ITIS | accepted | | Species |
| Antithamnionella elegans | 13140 | (Berthold) Price and John | | ITIS | accepted | | Species |
| Antithamnionella glandulifera | 13129 | | | ITIS | accepted | | Species |
| Antithamnionella pacifica | 13132 | | | ITIS | accepted | | Species |
| Antithamnionella sarniensis | 13139 | Lyle, 1922 | | ITIS | accepted | | Species |
