| Name | Cosmarium difficile f. rectangulum D. B. Williamson |
| Authorship | D. B. Williamson |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Cosmarium difficile Lütkemüller |
| Remarks | Created from Taxon Name Import: Cosmarium difficile f. rectangulum D. B. Williamson |
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