We present here a comprehensive list of 331 algal taxa (phytoplankton and littoral) reported from Mountain Lake since 1930. The total derived from 11 earlier investigations, Jervis, and our continuous 33-month (1985-87) study includes Chlorophyceae (54%), Cyanophyceae (13.8%), Bacillariophyceae (7.5%), Dinophyceae (7.0%), Chrysophyceae (6.0%), Euglenophyceae (4.9%), Cryptophyceae (4.0%), Charophyceae (1.5%), Xanthophyceae (1.0%), and Chloromonadophyceae (0.3%).