| Name | Calliergon cordifolium subsp. orbiculari-cordatum (Renauld & Cardot) Grout |
| Authorship | (Renauld & Cardot) Grout |
| Rank | Subspecies |
| NomenclaturalStatus | NomLeg |
| Placed in | Calliergon cordifolium (Hedwig) Kindberg |
| Citation | 1931 Moss Fl. N. Amer. 3: 96, 19B |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Calliergon cordifolium subsp. orbiculari-cordatum (Renauld & Cardot) Grout |
| Identification made in | [no date] (5) |
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