| Name | Bryum knowltonii var. ammophilum (R. Ruthe) Wijk & Margadant |
| Authorship | (R. Ruthe) Wijk & Margadant |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Bryum knowltonii Barnes |
| Citation | 1959 Taxon 8: 72 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Bryum knowltonii var. ammophilum (R. Ruthe) Wijk & Margadant |
| Identification made in | [no date] (2) |
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