http://kpabg.ru/cyanopro/?q=taxonomy/term/2121 Filaments isiopolar, 14 mkm wide; sheaths thin, trichomes to 12 mkm wide, gradually attenuated at both ends, acuminate, not constricted at cross-walls. Freshwater. Chung J. (1970). A taxonomic study on the freshwater algae from Youngnam area. pp. 1-115. Korea: Kyungpook National University Press. en