| Name | Siphonocladus rigidus M. Howe |
| Authorship | M. Howe |
| Rank | Species |
| NomenclaturalStatus | Unknown |
| Placed in | Siphonocladus F. Schmitz |
| Remarks | Created from Taxon Name Import: Siphonocladus rigidus M. Howe |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Siphonocladus rigidus M. Howe |
| Identification made in | [no date] (3) |
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