Dr. Johannes Leunis Synopsis der Pflanzenkunde 3: 222 (Frank 1886).
DESCRIPTION. — Filament mostly solitary, more or less straight or slightly curved; cells more or less short cylindrical, sometimes slightly lenticular, mostly separated from one another; heterocysts only basal, ovate, or globose or compressed globose; sheath thin, without lamellation (Fig. 8O).
DIMENSION. — Cells 3.6-5.8 µm broad; heterocysts 5.0-6.5 µm broad.
ENVIRONMENT & HABITAT. — Freshwater species; planktonic; temperature 0.5°C.