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TWO NEW SPECIES OF PSEUDOKEPHYRION (CHRYSOPHYCEAE) IN THE PLANKTON OF A LAKE 1

Two new species of Pseudokephyrion are described from Little Aurora Lake, Ontario, Canada. The distribution of both P. taeniatum sp. nov. and P. auroreum sp. nov. is restricted, for reasons which are not clear; neither species was found in samples from lakes adjacent to Little Aurora Lake. All lakes in the vicinity are very dilute, oligotrophic and acidic.