| Name | Ptilium crista-castrensis (Hedwig) De Notaris |
| Authorship | (Hedwig) De Notaris |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Ptilium |
| Citation | 1867 Comment. Soc. Crittog. Ital. 2(3): 283 |
| Holdings | 267 Specimens held in the Harvard University Herbaria identified as Ptilium crista-castrensis (Hedwig) De Notaris |
| Identification made in | [no date] (260), 2013 (1), 2016 (4), 2019 (2) |
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