Checklist of Plants of India

Calothrix fusca  Bornet & Flahault, Ann. Sci. Nat. Bot. ser. 7, 3: 364. 1886; Desikachary, Cyanophyta 527, t. 107, f. 10 & t. 113, f. 5 - 6. 1959.

var. fusca
Distribution : Andaman & Nicobar, Assam, Bihar, Gujarat, Himachal Pradesh, Jammu & Kashmir, Kerala, Madhya Pradesh, Maharashtra, Odisha, Punjab, Rajasthan, Tamil Nadu, Uttar Pradesh, Uttarakhand and West Bengal.

var. crassa C.S.Rao, Proc. Indian Acad. Sci., B. 9: 145, f. 1B - E. 1939; Desikachary, Cyanophyta 529, t. 113, f. 7 - 8, 10. 1959.
Distribution : Bihar and Uttar Pradesh.

var. minor (Wille) Geitler in Pascher’s, Süsswasserflora 12: 221. 1925; Desikachary, Cyanophyta 529. 1959.
Distribution : West Bengal.