Abstract
As early as in 1888, NORDSTEDT published some information about the algal flora of Rotorua lakes, on the North Island of New Zealand. He studied samples from the lakes Rotomahana and Tarawera, and made some notes on the algae in Lake Taupo. Since then a number of minor contributions with additional information about the algal flora of the Rotorua district have been published. The present paper describes the composition of phytoplankton in nine of the lakes in Rotorua district, and in Lake Taupo. These are all monomictic soft water lakes. The plankton is fairly rich in desmids, quantitatively as well as qualitatively. The study is based on random sampling by the author in March, 1968.

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