Rivularia is found growing on submerged stones, moist rocks, and damp soils near the riverside. It is found in colonies, and the trichomes are radially arranged within a colony, with each trichome wholly or partially surrounded by a gelatinous sheet. The trichomes have a basal heterocyst. Each trichome has a narrow aptical portion which is whip- or tail-like consisting of a row of small cells. Akinetes are absent in Rivularia. The species multiply with the aid of hormogonia and heterocyst.
Species
Rivularia atra Roth ex Bornet & Flahault, 1886
Rivularia bullata (Poir) Berkeley ex Bornet & Flahault, 1886
Rivularia haematites (De Candolle) Bornet & Flahault, 1886
Rivularia jaoi H.-J.Chu, 1952
Rivularia nitida C.Agardh ex Bornet & Flahault, 1886
Rivularia thermalis Y.-Y.Li, 1984
Species brought into synonymy
Rivularia cornudamae Roth, 1797: synonym of Chaetophora lobata Schrank, 1783
