| Name | Heterosiphonia coccinea f. crassa (J. Agardh) De Toni |
| Authorship | (J. Agardh) De Toni |
| Rank | Forma |
| NomenclaturalStatus | Unknown |
| Placed in | Heterosiphonia coccinea (Hudson) Falkenberg |
| Remarks | Created from Taxon Name Import: Heterosiphonia coccinea f. crassa (J. Agardh) De Toni |
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