Studies on Cyclotella meneghiniana Kutz III. The frustule

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On Camptylonema indicum Schmidle and Camptylonemops is gen. nov.

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Electron microscopy and algology

Since 1936, when the first alga was investigated with the help of the Electron Microscope more and more algae have been studied. These studies have greatly contributed to our knowledge of the submicroscopic morphology of algae. A review of the most important aspects of these investigations is given in this paper. The utilization of the results of these Electron Microscopic investigations in taxonomy is discussed

Taenioma J. Ag. from India

Both the known species of Taenioma, T. perpusillum J. Ag. and T. nanum (Kuetz.) Papenfuss, are here reported for the first time from India. General features of thallus organisation in both species are described in detail. The development of tetrasporangia in T.Perpusillum is described. In general, the writers' observations are in agreement with those of Papenfuss. The taxonomy of the genus is discussed and the authors agree with Papenfuss in keeping the two species distinct

Mastigocladopsis jogensis gen. et sp. nov., a new member of the stigonemataceae

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Effects of increased salinity on the diatom assemblage in Fonda Lake, Michigan

A salt storage facility has been located adjacent to Fonda Lake since 1953. In February 1981 a core was taken from the profundal sediments of the lake and analyzed to determine the effects of salt perturbation on the diatom community over a 32-year period. Diatom assemblages from different levels were compared using multivariate techniques including cluster analysis and principal component analysis. Shifts in diatom composition related to salinification were revealed most clearly by subdominant taxa. Five distinct groups of diatom taxa were found to correspond with 5 depth intervals. The diatom component of the lake up to 1960 included two groups of taxa which were alkaliphilous and chloride indifferent. A reduction in species diversity beginning in 1960 may indicate a salt effect. By 1968, when diversity reached a minimum, a variety of halophilic taxa (including Diatoma tenue, Navicula gregaria and Synedra fasciculata ) attained their highest relative abundances. At the top of the core, diversity increased slightly and some halophilic taxa decreased in relative abundance, which suggests a possible decrease in salt loading to the lake.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42866/1/10750_2004_Article_BF00011577.pd