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This paper presents a new record for a heterotypic synonym of Pithophora roettleri ( P. oedogonia ) for the Sao Franscisco River basin. Pithophora are green filamentous algae, branched, with intercallary akinetes of variable ( P. roettleri ) or invariable ( P. oedogonia ) forms in the same individual. The species was found in a temporary pond, which has high electrical conductivity and temperature, and is localized in a semiarid area (Caatinga biome). The soil has median natural fertility and high concentration of dissolved salts. A short diagnosis with illustrations and two models of the potential geographic distribution for the species are included.

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New record of Pithophora roettleri (Roth) Wittrock, 1877 (Chlorophyta: Pithophoraceae) for the São Francisco River basin and its potential geographic distribution in Brazil