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Thallus single, straight or bent with almost rounded ends cells, 5.4 μm broad at the

apex, cells barrel- shaped, spherical heterocysts, 6.5- 8 μm broad, adjoining the hetrocysts
almost spherical with smooth hyaline outer wall, 5- 7.8 μm broad and 3.5- 8.5 μm long.

Distribution: Assam (Deka and Bordoloi, 1991; Ahmed et al., 1999; Hazarika, et al., 2001,
Ahmed, 2001; Ahmed and Kalita, 2002), Orissa (Padhy; 1992, Das, 2002), Tamilnadu

(Anand and Subramanian, 1994), Kerala (Shaji and Panikkar, 1994; Anand and Hopper,
1995), Uttar Pradesh (Mishra et al., 2001 a and b), Andhra Pradesh (Rao et al., 2008).

17. Anabaena orientalis Dixit (Pl.- IV, Fig. 20).

Desikachary, 1959: 405.
Trichome single, slightly curved, 2.5 µm broad, cells cylindrical, 4.0 µm long, end

cells conical with rounded apex; heterocyst single, intercalary, cylindrical, rounded 5.3 µm

broad, 7.6 µm long.
Distribution: Maharashtra (Dixit, 1936; Auti, 2007), Delhi (Fritsch, 1949), Madhya Pradesh

(Prasad et al., 1986), Uttar Pradesh (Pal, 1975), West Bengal (Sahu and Mukherjee, 1975),
Orissa (Padhy et al., 1992), Assam (Talukdar and Sarma, 1998; Ahmed et al., 1999; Ahmed,

2001; Hazarika et al., 2001; Ahmed and Kalita, 2002), Rajasthan (Tiwari et al., 1999;
Parvateesam and Sharma, 2001).

18. Anabaena circinalis Rabenh. ex Born. et Flah. (Pl.- IV, Fig. 21).

Desikachary, 1959: 414.

Thallus free-swimming, frothy, trichome circinate, loosely coiled, without sheath,

10.0 µm broad, cells spherical; heterocysts sub-spherical, 9.3 µm broad, spores cylindrical,
ends rounded, 16.2 µm broad, 32 µm long, away from the heterocyst.

Distribution: Delhi (Fritsch, 1949), Assam (Talukdar and Sarma, 1998; Ahmed et al., 1999;
Ahmed, 2001; Ahmed and Kalita, 2002), Rajasthan (Parvateesam and Sharma, 2001), West

Bengal (Singh et al., 2001), Jammu and Kashmir (Ara et al., 2002), Maharashtra (Auti and
Pingle, 2006; Auti, 2007).

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