| Name | Atrichum undulatum var. haussknechtii (Juratzka & Milde) Frye |
| Authorship | (Juratzka & Milde) Frye |
| Rank | Variety |
| Placed in | Atrichum undulatum (Hedwig) P. Beauvois |
| Citation | 1937 Moss Fl. N. Amer. 1: 103 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Atrichum undulatum var. haussknechtii (Juratzka & Milde) Frye |
| Identification made in | [no date] (2) |
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