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Two new sites with benthic freshwater alga Hydrurus foetidus (Villars) Trevisan have been discovered in Dinaric Ecoregion of Croatia. The sites are located in two karst watercourses: Kupa River and Slušnica River. Both sites are non-shadowed aquatic habitats, with developed vegetation characteristic for clear, running waters. The alga was found during summer months at its disintegration stage, and during autumn at the beginning of its growing stage. In the Kupa River, incrusted calcium carbonate was found within the thalli of H. foetidus. After the first known record in Bijela Rijeka River from 2015, our findings represent the second and the third known localities of this species in Croatia. Even though the vegetation composition indicates high ecological status of the sites, future anthropogenic impacts and climatic changes could become a threat to this underexplored species in Croatia.

New sites of rare cold-water golden algae Hydrurus foetidus (Villars) Trevisan (Ochrophyta: Chrysophyceae) in Croatia