| Name | Calliergon orbiculare-cordatum (Renauld & Cardot) Brotherus |
| Authorship | (Renauld & Cardot) Brotherus |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Calliergon |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Calliergon orbiculare-cordatum (Renauld & Cardot) Brotherus |
| Identification made in | 1966 (1), 1967 (5) |
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