| Name | Ptilidium californicum (Austin) Pearson |
| Authorship | (Austin) Pearson |
| Rank | Species |
| Placed in | Ptilidium |
| Citation | 1890 List Canad. Hepat. 7 |
| Holdings | 29 Specimens held in the Harvard University Herbaria identified as Ptilidium californicum (Austin) Pearson |
| Identification made in | [no date] (29) |
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