The result shows interesting observations. Of these following three taxa, viz., Anabaena anomala Fritsch, Calothrix weberi Schmidle, Rivularia hansgirgi Schmidle have been reported for the first time from West Bengal. ex Gomont, Oscillatoria proteus Skuja, Oscillatoria subbrevis Schmidle, Spirulina gigantea Schmidle and Spirulina meneghiniana Zanard. ex Gomont, Lyngbya stagnina Kützing, Oscillatoria nigra Vaucher, Oscillatoria okeni Ag. conica Dixit, and Rivularia hansgirgi Schmidle while non-heterocystous members like Katagnymene pelagica Lemm., Lyngbya major Menegh. tenuis Rao C B, Calothrix weberi Schmidle, Gloeotrichia raciborskii Woloszynska var. et Flah., Aulosira fertilissima Ghosh var. In this work heterocystous members like Anabaena anomala Fritsch, Aphanizomenon flos-aquae (Linn.) Ralfs ex Born. These algae have been collected from a pond and its adjoining rice field areas of Karjona, Burdwan of West Bengal. In the present communication, sixteen members of Nostocales of Cyanophyta have been described. Physico-chemical characters and soil nutrients were correlated with distribution of cyanobacteria. Heterocystous forms showed limited distribution and diversity. The maximum numbers of cyanobacteria were found to be non-heterocystous forms. Totally 32 species were identified in which 13 species were heterocystous from belonging to genera Anabaena (2), Nostoc (3), Cylindrospermam (1), Rivularia (2), Calolhrix (1), Scytonema (1), Tolypothirix (1), Hapalosiphon (1), Westiellopsis (1) and 21 species were non heterocystous form belonging to genera Chroococcus (1), Gleocapsa (1), Microcystis (3), Spirulina (1), Oscillatoria (6), Phormidium (3), Cynsbya (5). In the present study, the cyanobacterial samples were collected from different paddy fields. ![]() Cyanobacteria form a large group of structurally complex and ecologically significant gram negative prokaryotes which flourish in rice fields and play very important role in all the type of water bodies and soils whether they being heterocystous or non-heterocystous form.
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