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Abstract
A five year long study carried out to assess the diversity of Oedogonium revealed that a total of 62 taxa were reported from north-west Barind tract of Bangladesh, of which twenty taxa as new records for the country. These are Oedogonium borisianum (Le Cl.) Wittr. var. crassa Singh, O. cardiacum Hass. f. minor Roll, O. cardiacum Hass. f. thermalis Petk, O. crassum (Hass.) Wittr. f. indica Goy, O. ellipsosporum Singh, O. glabrum Hall. f. glabrum, O. glabrum Hall. f. maharastrense Kam, O. gracilius (Wittr.) Tiff. var. globosum Gauth.-Liev., O.hians Nordst. et Hirn var. leytense Britt, O. howardii G. S. West, O. intermedium Wittr. var. intermedium f. intermedium, O. longipilum Jao, O. lusitanicum Lac., O. macrandrium Wittr. var. parvulum Jao, O. oviforme (Lew.) Hirn var. oviforme, O. parvum Jao, O. pringsheimii Cram. var. nordstedtii Wittr., O. quintanilhae Lac., O. subellipsoideum Tiff. and O. vaucherii (Le Cl.) A. Br. var. parvum Gonz. et Sonn. All the new reported taxa where epiphytically growing on angiosperms. Present study further revealed that the optimum pH range for the occurrence of Oedogonium was 7.3-8.0.