Aulosira fritschii Bharadwaja

Annals of Botany 47: 123, f. 3-4 (Bharadwaja 1933). Desikachary, Cyanophyta 432, t. 80, f. 7-12 (Desikachary 1959).

DESCRIPTION. — Filament long, more or less straight or slightly bent; sheath hyaline, outer portion diffluent; trichome constricted at the cross-walls; cells contents finely granular; heterocysts single and intercalary, cylindrical, rarely elongate cylindrical (Fig. 8N).

DIMENSION. — Filament 12.0-21.0 µm broad; trichome 7.0-14.0 µm broad; heterocysts 8.2-14.0 µm broad.

ENVIRONMENT & HABITAT. — Freshwater species; pond & lake; temperature 0.5°C.