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constricted at the cross walls, heterocysts oblong- cylindrical. Cells 8-12 µm broad as long as

broad. Heterocystis 5.5-6 µm broad and 10-20 µm long.
Accession No. CTR00069

20. Nostoc ellipsosporum N. L. Gardner (Pl. 2, Fig. B)
(Desikachary 1959, pg. 383, pl.69, fig. 5)

Phylum: Cyanobacteria
Class: Cyanophyceae

Order: Nostocales

Family: Nostocaceae
Genus: Nostoc

Thallus microscopic gelatinous, irregularly expanded, filaments flexuous, loosely entangled,

cells cylindrical, heterocysts subspherical to oblong. Cells 6-12 µm long, 4-4.5 µm in
diameter, Heterocysts 7-9 µm long, 6-8 µm in diameter.

Accession No. CTR00070
21. Pseudofallacia tenera (Hustedt) Y. Liu, Kociolek & Q. Wang (=Fallacia tenera Hustedt

D.G. Mann) (Pl. 2, Fig. K)
(Karthick et al. 2013, pg.44, fig.44)

Phylum: Bacillariophyta

Class: Bacillariophyceae
Order: Naviculales

Family: Sellaphoraceae
Genus: Pseudofallacia

Valve linear-elliptical with broadly rounded apices, ends not produced. Small lyre-shaped
hyaline area present. Striae are composed of distinct puncta. Valve 11-15 µm long, 4.5-5 µm

in diameter, Striae density 15-18 in 10 µm area.

Accession No. CTR00071

12