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Rivularia
''Rivularia'' is a genus of cyanobacteria of the familia ''Rivulariaceae''.〔Guiry, Michael D. (2014). Rivularia C.Agardh ex Bornet & Flahault, 1886. In: Guiry, M.D. & Guiry, G.M. (2014). AlgaeBase. World-wide electronic publication, National University of Ireland, Galway (taxonomic information republished from AlgaeBase with permission of M.D. Guiry). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=146623 on 2014-12-09〕 ==Description== ''Rivularia'' is found growing on submerged stones, moist rocks and on damp soils near the riverside. The alga 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''. Rivularia multiplies with the aid of hormogonia and heterocyst.
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