| Name | Calliergon cordifolium var. angustifolium G. Roth |
| Authorship | G. Roth |
| Rank | Variety |
| Placed in | Calliergon cordifolium (Hedwig) Kindberg |
| Citation | 1904 Eur. Laubm. 2: 572 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Calliergon cordifolium var. angustifolium G. Roth |
| Identification made in | [no date] (1) |