Annales des Sciences Naturelles, Botanique, Série 7 (16): 220 (1892). Desikachary, Cyanophyta 222, t. 42, f. 15 (Desikachary 1959). Komárek & Anagn., Cyanoprokaryota Part 2: Oscillatoriales 19 (2): 587, 878 (Komárek & Anagnostidis 2005).
DESCRIPTION. — Trichome more or less straight or very slightly curved, very slightly constricted or not constricted at the crosswalls; not attenuated at the apices but very slightly rarely curved at the end, not capitate; septa mostly granulated; apical cell more or less hemispherical or rounded; outer membrane sometimes slightly thickened (Fig. 8M).
DIMENSION. — Trichome 5.8-11.5 µm broad and cells 2.13-3.5 µm long.
ENVIRONMENT & HABITAT. — Freshwater species; free-floating, wet rocks & moist stones; temperature 2°C.