Taxonomic assessment of Zygnemataceae Bangladesh perspective

Record from National and International literature from 1966 to 2006, six genera of Zygnemataceae recorded from different districts of Bangladesh. Among these, Mougeotia Agardh are represented 23 taxa, Sirogonium Kützing four taxa, Spirogyra Link 66 taxa, Sirocladium Randhawa, Temnogametum W. & G.S. West solitary taxa each and Zygnema Agardh 12 taxa. Maximum diversity of the taxa was observed in central part of Bangladesh. About 80% habitats were lentic type, while the others are of lotic type. In Bangladesh all the taxa of Zygnemataceae are reported to be found in freshwater habitats and found all the season specially in winter period. Distribution pattern and habitats of Zygnemataceae reveal that they are capable of growing in diversified habitat including varying degrees of alkalinity, acidity (pH = 6-7.5).