All known records indicate that Padina concrescens is endemic to the Galápagos Islands; so far reported from: Floreana: Black Beach (Taylor 1945: type locality) and Post Office Bay (2004 UC, K.A. Miller pers. comm.). Santa Fé: two localities (2004 UC, K.A. Miller pers. comm.). Isabela: Tagus Cove (Taylor 1945). Fernandina: Punta Espinosa (Wellington 1975). Española: Gardner Bay (Taylor 1945). Santa Cruz: Academy Bay (1973 CDS).
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