| Name | Batrachospermum keratophytum var. chalybeum P. Crouan & H. Crouan |
| Authorship | P. Crouan & H. Crouan |
| Rank | Variety |
| Placed in | Batrachospermum keratophytum Bory |
| Holdings | 23 Specimens held in the Harvard University Herbaria identified as Batrachospermum keratophytum var. chalybeum P. Crouan & H. Crouan |
| Identification made in | [no date] (23) |
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