| Name | Chamaesiphon cylindricus Boye Petersen |
| Authorship | Boye Petersen |
| Rank | Species |
| Placed in | Chamaesiphon A. Braun |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Chamaesiphon cylindricus Boye Petersen |
| Identification made in | [no date] (3) |
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