| Name | Atrichum undulatum var. altercristatum Renauld & Cardot |
| Authorship | Renauld & Cardot |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Atrichum undulatum (Hedwig) P. Beauvois |
| Citation | 1890 Bot. Gaz. 15: 58 |
| Holdings | 6 Specimens held in the Harvard University Herbaria identified as Atrichum undulatum var. altercristatum Renauld & Cardot |
| Identification made in | [no date] (6) |
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