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Diatoms were collected from the Srikhola River of Darjeeling district, West Bengal in Eastern Him... more Diatoms were collected from the Srikhola River of Darjeeling district, West Bengal in Eastern Himalaya. Four taxa, namely, Diatoma mesodon (Ehrenberg) Kützing, Fragilaria capucina var. vaucheriae (Ehrenberg) Kützing, Punctastriata linearis Williams & Round and Ulnaria ulna (Nitzsch) Compère were observed using differential interference contrast (DIC) and field-emission scanning electron microscopy (FE-SEM) and identified in light of modern diatom taxonomic trends. Limnological analysis of Srikhola River indicates its water is clean and not polluted. Diatoma mesodon and Punctastriata linearis are strictly confined to hilly streamline as epilithic form. Fragilaria capucina var. vaucheriae and Punctastriata linearis are reported for the first time from West Bengal.

The present communication dealt with 20 taxa belongs to 14 genera of fresh water diatoms from dif... more The present communication dealt with 20 taxa belongs to 14 genera of fresh water diatoms from different aquatic habitats of Joypur forest of Bankura district, West bengal.

Kützing were observed using scanning electron microscopy (SEM) and identified in light of modern ... more Kützing were observed using scanning electron microscopy (SEM) and identified in light of modern diatom taxonomic trends. Except Eunotia minor, all these taxa are new records to Eastern India. A note on the taxonomy of Achnanthes pseudobiasolletiana as described by Gandhi and Eunotia serrata var. diadema (Ehr.) R. M. Patrick as reported by Dwivedi and Misra has been added.

Dinoflagellates are of infrequent occurrence in freshwaters. They are ephermeral and often form b... more Dinoflagellates are of infrequent occurrence in freshwaters. They are ephermeral
and often form bloom in those waters. During the taxonomic investigations on the
algal flora of Eastern India the authors recorded eight taxa of dinoflagellates from
different habitats of West Bengal. They belong to four genera viz. Peridinium (2),
Ceratium (3), Gymnodinium (2) and Glenodinium (1). All the eight taxa are new
record for Eastern India. Following five taxa are new record for India: Peridinium
umbonatum Stein var. goslaviense (Woloszyńska) Popovský and Pfeister, Ceratium
furcoides (Levander) Langhans, Gymnodinium fuscum (Ehrenburg) Stein,
Gymnodinium cnecoides Harris and Glenodinium bernardinense Chodat & Zender.
Ceratium hirundinella (O.F.Müller) Dujardin and Ceratium cornutum (Ehrenberg)
Claparède and Lachmann appear to be new record for the main land. Peridinium
willei Huitfeld-Kass is the most common freshwater species of dinoflagellate all
over the globe. All the species were found growing in the winter months of the
year between a temperature range of 210C-250C although persist till the onset of
summer. They prefer acidic conditions although not extreme.

During the systemic investigations on the desmid biodiversity of Manmecho (Mamencho) lake, Sikkim... more During the systemic investigations on the desmid biodiversity of Manmecho (Mamencho) lake, Sikkim, Eastern Himalaya, authors recorded 12 taxa belonging to the 5 genera viz. Closterium Nitzsch (5), Cosmarium Corda (4), Netrium Naegeli (1), Penium De Brébisson (1) and Hyalotheca Ehrenberg . The following 5 taxa have been recorded as new to Indian flora: Closterium arcuarium Hughes var. arcuarium, Cosmarium impressulum Elfving var. suborthogonum Taft f. suborthogonum, Cosmarium montrealense Croasdale, Cosmarium minimum West et G.S. West var. subrotundum and Netrium interruptum (Brébisson) Lütkemu ller var. minor (Borge) Krieger. Rest are new records for Eastern Himalaya. All are recorded for the first time from the Mamencho Lake & Sikkim state.

The present investigation concerns the seasonal changes of phytoplankton diversity and physico-ch... more The present investigation concerns the seasonal changes of phytoplankton diversity and physico-chemical characteristic of
water in a lentic water body. Diversity indices of 58 phytoplankton species and the regulatory effects of the 10 physico-chemical
parameters of water on the phytoplankton diversity were assessed. The phytoplankton diversity, richness and dominance were
high in winter but the evenness was high in the months of pre-summer. From the Euclidean distance of seasonal variation of
phytoplankton diversity and physico-chemical parameters of water it was revealed that the phytoplankton diversity were changed
with the seasonal i.e. pre-monsoon, monsoon and post-monsoon changes of physico-chemical parameters.

Porphyra vietnamensis Tanaka & P.H. Ho was collected from the east coast (various parts of Visakh... more Porphyra vietnamensis Tanaka & P.H. Ho was collected from the east coast (various parts of Visakhapatnam) of India during a low tide status. Detailed morphology of the taxon was studied. The present specimens are smaller than the type material originally described but slightly bigger than the material described from Visakhapatnam coast

Enteromorpha Link is the most common green seaweed of Indian coasts and estuarine waters. The kn... more Enteromorpha Link is the most common green seaweed of Indian coasts and estuarine waters.
The knowledge about the distribution of its species in India is however, insufficient. During an algal
excursion to Visakhapatnam coast, the authors encountered following three taxa of the genus viz., E.
f l exuosa (Wulfen) J. Ag. subsp.flexuosa, E.flexuosa subsp. paradoxa (C.Ag.) Bliding and E. lingulata
J.G. Ag. First and third taxa constitute new record from Visakhapatnam coast.

Algological Studies, 2011

Reports of endophytic or endosymbiotic cyanoprokaryotes in higher plants are not uncommon, but on... more Reports of endophytic or endosymbiotic cyanoprokaryotes in higher plants are not uncommon, but only a few genera are known to occur in such conditions. Of them Nostoc and Anabaena are most common. They are known in the roots of cycads and in the stem nodules of an angiosperm Gunnera. Calothrix and Aphanocapsa are the only other genera of cyanoprokaryotes, which have been reported to grow endosymbiotically in the roots of Encephalartos hildebrandtii and Cycas beddomei, respectively. There are, until now, no reports about an association of non-heterocystous members of cyanoprokaryotes and other plants. While working on the biodiversity of cyanoprokaryotes of Burdwan district of West Bengal an Oscillatoria species (O. obscura Brühl et Biswas) and a Nostoc [N. punctiforme (KütZ.) hariot ex Born. et flah.] species were recovered in endophytic conditions occurring within the cortical cells of the angiosperm Alternanthera sessilis r. Br. (Family Amaranthaceae). It is interesting to note that this is also the first report of the occurrence of Nostoc sp. in an angiosperm other than Gunnera.

Limnological Review, 2012

A total of 44 taxa were observed in monthly sampled phytoplankton of the Shibpukur pool in Burdwa... more A total of 44 taxa were observed in monthly sampled phytoplankton of the Shibpukur pool in Burdwan, West Bengal between March, 2010 and February, 2011. The most abundant taxa belong to Charophyta, followed by cyanobacteria, diatoms and euglenoids. Bio-indication shows that the pool community preferred low alkaline, low mineralized and low organically polluted water. The total phytoplankton density showed its maximum values in May, 2010. The Shannon-Weaver diversity index and the Pielou evenness value were found to be highest during the post-monsoon season. The Simpson dominance index and the Margalef index of richness were highest in the pre-monsoon season. The total phytoplankton density showed a highly significant positive correlation with pH and salinity and significant positive correlation with air temperature, water temperature, dissolved oxygen and total suspended solids. Among the reported 44 phytoplankton taxa only 3 showed a random distributional pattern. The Bray-Curtis Cluster analysis and the comparative statistics reveal two groups of phytoplankton assemblages in respect to the monsoon seasons. The successive communities form a continuum corresponding to Colwell's Constancy (C) category. The calculated indices, CCA, and bio-indication analysis exhibit a low pollution level in the Shibpukur pool that can be used as a model of aquatic community dynamics under seasonal fluctuation in the monsoon climate, applicable for monitoring of water bodies in the West Bengal Province.

Algological Studies, 2011

Limnological Review, 2012

During the systematic investigations on the fresh water green algae of the surroundings of Burdwa... more During the systematic investigations on the fresh water green algae of the surroundings of Burdwan town the authors recorded 11 taxa under chlorophycean orders Chaetophorales and Ulotrichales. Chaetophoralean members represent species of Microthamnion (1), Chaetophora (1), and Protoderma whereas Ulotrichalean members represent Pearsoniella (1), Radiofilum (1), Cylindrocapsa (1), Microspora (1), Hormidium (1), Uronema (1) and Ulothrix (1). Radiofilum conjuntivum Schmidle and Microspora membranacea Wang are being reported for the first time from India. Chaetophora attenuata Hazen, Microthamnion strictissimum Rabenhorst & Hormidium subtile (Kützing) Heering are reported for the first time from West Bengal.

West Bengal has much suitable habitat for heterocystous Cyanoprokaryota but the work done in this... more West Bengal has much suitable habitat for heterocystous Cyanoprokaryota but the work done in this state is insufficient. Therefore, area wise and group wise floristic work has been undertaken. In this communication three genera namely Calothrix, Gloeotrichia and Rivularia from Hooghly district have been presented. Calothrix is represented by 6 species, Gloeotrichia by 4 species and Rivularia by one species. Of these five species of Calothrix and one species of Gloeotrichia are new records for algal flora of West Bengal.

The present paper deals with the eco-taxonomic observations on Epithemia adnata (Kützing) Brébiss... more The present paper deals with the eco-taxonomic observations on Epithemia adnata (Kützing) Brébisson collected from Murguma reservoir of Purulia district in West Bengal, India. For this purpose Differential interference contrast (DIC) and phase contrast images were taken covering whole size range of the valves and FE SEM also done. Ecological parameters were also considered. Authors tried to compare these taxa with the other six taxa of “adnata” group available from scientific literature.

In the present communication, sixteen members of Nostocales of Cyanophyta have been described. Th... more In the present communication, sixteen members of Nostocales of Cyanophyta have been described. These algae have been collected from a pond and its adjoining rice field areas of Karjona, Burdwan of West Bengal. In this work heterocystous members like Anabaena anomala Fritsch, Aphanizomenon flos-aquae (Linn.) Ralfs ex Born. et Flah., Aulosira fertilissima Ghosh var. tenuis Rao C B, Calothrix weberi Schmidle, Gloeotrichia raciborskii Woloszynska var. conica Dixit, and Rivularia hansgirgi Schmidle while non-heterocystous members like Katagnymene pelagica Lemm., Lyngbya major Menegh. ex Gomont, Lyngbya martensiana Menegh. ex Gomont, Lyngbya stagnina Kützing, Oscillatoria nigra Vaucher, Oscillatoria okeni Ag. ex Gomont, Oscillatoria proteus Skuja, Oscillatoria subbrevis Schmidle, Spirulina gigantea Schmidle and Spirulina meneghiniana Zanard. ex Gomont have been investigated. 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. The result shows interesting observations. Most of the heterocystous members like Anabaena anomala, Aphanizomenon flos-aque and Aulosira fertilissima var. tenuis appear early but thrive till December, i.e., they are unable to withstand extreme winter while Gloeotrichia raciborskii var. conica and Rivularia weberi appear late in winter and can withstand winter till onset of summer. Non heterocystous members are however better adapted to environment conditions and can tolerate odds including the summer although unable to survive in extreme dry months in vegetative condition. Occurrence of Katagnymene pelagica is rather sporadic.