| Name | Gelidium corneum f. clavatum Ardissone |
| Authorship | Ardissone |
| Rank | Forma |
| Placed in | Gelidium corneum (Hudson) J. V. Lamouroux |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Gelidium corneum f. clavatum Ardissone |
| Identification made in | [no date] (2) |
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