| Name | Cylindrospermum phaeospermum Rabenhorst |
| Authorship | Rabenhorst |
| Rank | Species |
| NomenclaturalStatus | NomInvalid |
| Placed in | Cylindrospermum Kützing ex Bornet & Flahault |
| Citation | 1856 Algen Sachsens 53/54: no. 530 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Cylindrospermum phaeospermum Rabenhorst |
| Identification made in | [no date] (1) |
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