Gracilaria mammillaris
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Gracilariales
- family: Gracilariaceae
- genus: Gracilaria
- species: Gracilaria mammillaris
- Hamilton
Hamilton city- Saint George
Saint George
Bermuda- Cartagena
Bolívar
Colombia- Boca de Yuma
La Altagracia
Dominican Republic- Jérémie
GrandʼAnse
Haiti- Boquerón
- Puerto Real
Cabo Rojo- Culebra
Culebra- Fuig
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Penuelas- Martorell
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Puerto Rico- Juno Beach
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Florida- Medford
Massachusetts
United States- Juan Griego
Nueva Esparta
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