Abstract
The growth of clonal isolates of Closterium moniliferum and Cosmarium granatum from hard waters and Triploceras gracile from an acid bog was examined at two different levels of calcium and pH. Low pH and low calcium favored the growth of Triploceras, whereas Closterium grew equally well at both calcium levels but preferred the higher pH. Cosmarium favored both high pH and a high calcium concentration. Each taxon was affected by an interaction of the parameters on the growth rates. The results from studies on these taxa do not completely support the generalizations generated by previous investigations on the chemical factors affecting the growth and distribution of desmids; the controlling influences may, therefore, involve a complex interaction of factors which are unique for individual taxa or groups of taxa.
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