Melanothamnus

{{Short description|Genus of algae}}

{{Automatic taxobox

|image =

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|taxon = Melanothamnus

|authority = Bornet & Falkenberg, 1901

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Melanothamnus is a genus of red algae belonging to the family Rhodomelaceae.{{cite web |title=Melanothamnus Bornet & Falkenberg, 1901 |url=https://www.gbif.org/species/2661346 |website=www.gbif.org |access-date=10 May 2021 |language=en}}

The genus has cosmopolitan distribution.

Species:

• Melanothamnus collabens {{small|(C.Agardh) Díaz-Tapia & Maggs}}
• Melanothamnus harveyi {{small|(Bailey) Díaz-Tapia & Maggs}}
• Melanothamnus maniticola
• Melanothamnus sphaerocarpus {{small|(Børgesen) Díaz-Tapia & Maggs}}
• Melanothamnus strictissimus {{small|(Hook.f. & Harv.) Diaz-Tapia & Maggs}}