| Name | Calliergon giganteum var. tenuis Karczmarz |
| Authorship | Karczmarz |
| Rank | Variety |
| Placed in | Calliergon giganteum (Schimper) Kindberg |
| Citation | 1971 Monogr. Bot. 34: 100 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Calliergon giganteum var. tenuis Karczmarz |
| Identification made in | [no date] (2) |
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