| Name | Calliergon giganteum var. fluitans G. Roth |
| Authorship | G. Roth |
| Rank | Variety |
| Placed in | Calliergon giganteum (Schimper) Kindberg |
| Citation | 1904 Eur. Laubm. 2: 574 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Calliergon giganteum var. fluitans G. Roth |
| Identification made in | [no date] (1), 1967 (1) |
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