A total of 108 algal taxa belonging to 57 genera and nine classes (excluding Chlorophyceae), namely, Cyanophyceae 28, Euglenophyceae 37, Chloromonadophyceae 1, Charophyceae 3, Xanthophyceae 11, Chrysophyceae 4, Bacillariophyceae 20, Dinophyceae 2 and Rhodophyceae 2 have been recorded from some acidic habitats within the tea gardens at Srimangal, Maulvi Bazar. Of these 13 are new records for Bangladesh. Key words: Acidic habitats; diversity; phytoplankton; periphyton; new records DOI: 10.3329/bjpt.v12i1.609Bangladesh J. Plant Taxon. 12(1): 33-52, 2005 (June)

The paper deals with 13 taxa belonging to Desmid genus Staurastrum Meyen from some selected areas of Bangladesh. Of these, eight taxa are new records for Bangladesh and two taxa are new to science.

Fifty nine taxa of desmids under 17 genera, namely Cylindrocystis, Netrium, Spirotaenia, Gonatozygon, Penium, Closterium, Pleurotaenium, Triploceras, Triplastrum, Hyalotheca, Groenbladia, Bambusina, Teilingia, Sphaerozosma, Spondylosium, Onychonema and Desmidium have been recorded from different aquatic habitats located within the tea gardens at Srimangal, Maulvi Bazar. Eight taxa are described as new records for Bangladesh including two genera, namely, Cylindrocystis and Spirotaenia.

Ninety-three desmid taxa belonging to four genera, namely Euastrum, Micrasterias, Actinotaenium and Cosmarium have been recorded from different aquatic habitats located within the tea gardens at Srimangal, Maulvi Bazar. Of these, 20 are described as new records for Bangladesh, including a new variety, E. substellatum Nordst. var. bangladeshicum Islam & Irfanullah var. nov. and a new forma, Cosmarium depressum (Näg.) Lund. var. apertum (Turner) Hirano fa. spinosum Islam and Irfanullah fa. nov. Key words: acidic habitats, species diversity, phytoplankton, desmids, new taxa, new records DOI: 10.3329/bjpt.v13i1.589 Bangladesh J. Plant Taxon. 13(1): 1-20, 2006 (June)

In this last instalment of the series, 78 desmid taxa belonging to four genera, namely Xanthidium (8 taxa), Arthrodesmus (3 taxa), Staurodesmus (11 taxa) and Staurastrum (56 taxa) have been recorded from different aquatic habitats located within the tea gardens at Srimangal, Maulvi Bazar. Of these, nine are described as new records for Bangladesh. An overall assessment of the algal flora of the study area reveals desmids as the single largest group consisting of 230 taxa out of 421 recorded algal taxa. The paper comments on the conservation potentials of the studied aquatic habitats as monitoring tools of land use pattern like tea-gardening. Key words: Acidic habitats, Species diversity, Conservation, Phytoplankton, New records DOI: 10.3329/bjpt.v13i2.583 Bangladesh J. Plant Taxon. 13(2): 111-129, 2006 (December)