Abstract
During the study of the benthic marine algae from Saquarema to Itacoatiara (Rio de Janeiro State) little epiphytic species of Phaeophyta were collected upon thalli of Sargassum filipendula C. Agardh. Among these: Myrionema strangulans Greviille (Myrionemataceae) a new record for the Brazilian coast, Hecatonema floridana (Taylor) Taylor (Myrionemataceae) a new record for the southeast region, and Elachista minutissima Taylor (Elachistaceae) a new record for the Rio de Janeiro State.