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et al., 1999; Ahmed, 2001; Hazarika et al., 2001; Ahmed and Kalita, 2002), Manipur (Devi et

al., 1999), Rajasthan (Tiwari, et al., 1999; Vishnoi and Srivastava, 2004), Jammu and
Kashmir (Ara et al., 2002), West Bengal (Tirkey and Adhikary, 2005).

6. Nostoc rivulare Kuetz. ex Born. et Flah. (Pl.- II, Fig. 8).
Desikachary, 1959: 379.

Thallus globose, hollow, lobed; pale green or yellowish; filaments loosely entangled,
flexuous; sheath distinct; trichome 4.1 µm broad, cells spherical to oblong; heterocysts

oblong, 5.3 µm broad; spores oblong, 6.5- 8.0 µm broad, 7- 10 µm long.

Distribution: Uttar Pradesh (Gupta, 1966), Kerala (Anand and Hopper, 1995;
Madhusoodanan and Dominic, 1995), Jammu and Kashmir (Ara et al., 2002), Orissa (Das

and Dash, 2005), Maharashtra (Auti and Pingle, 2006; Auti, 2007).

7. Nostoc sporangiaeforme Agardh ex Born. et Flah. var. tenue Rao, C.B. (Pl.- II, Fig. 9).
Desikachary, 1959: 380.

Thallus gelatinous, mass expanded, thin, brownish, sheath colourless, diffluent;
trichomes 3.8 µm broad; cells spherical; spores in chains, 6.7- 7.0 µm broad, 8.5- 10.5 µm

long, outer membrane colourless and smooth.
Distribution: Uttar Pradesh (Rao, 1936; Bendre and Kumar, 1975; Pal, 1975; Singh, 2001),

Tamilnadu (Rao, 1938), West Bengal (Sinha and Mukherjee, 1975), Kerala (Anand and

Hopper, 1995), Andhra Pradesh (Suseela and Goyal, 1995 b), Maharashtra (Shinde, 1995;
Patil, 2000; Pingle and Deshmukh, 2005; Deshmukh and Pingle, 2005 b, 2006; Auti and

Pingle, 2006; Auti, 2007), Assam (Ahmed et al., 1999; Hazarika et al., 2001), Jammu and
Kashmir (Shashikant and Vohra, 1999), Orissa (Sahu, 2000; Das, 2002, 2005), Rajasthan

(Vishnoi and Srivastava, 2004).
Nostoc sporangiaeforme Agardh ex Born. et Flah. var. varians Rao, C.B. (Pl.- II, Fig. 10)

Desikachary, 1959: 381.

Plant mass thin, spreading blue green, trichomes loosely entangled, sometime
individually developed by yellowish brown mucilage, 3.1- 3.5 m broad; cell barrel shaped,

2.4- 3.5 m long. Heterocyst barrel shaped or cylindrical with rounded or flat ends, broader

than trichomes, 4.8- 6.5 m broad and 5.5- 8.1 m long.

Distribution: Uttar Pradesh (Rao, 1936; Bendre and Kumar, 1975; Mishra et al., 2001 a, b),
Tamilnadu (Rao, 1938), Orissa (Rao, 1939), Madhya Pradesh (Tiwari, 1972), Kerala (Anand

and Hopper, 1995), Andhra Pradesh (Suseela and Goyal, 1995 a, b; Rao et al., 2008), Assam
(Ahmed et al., 1999, Ahmed, 2001), Maharashtra (Auti, 2007).

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