The article presents proceedings of the Annual meeting of the Phycological Society of America at the University of Minnesota, Minneapolis, Minnesota, held between August 27-September 1, 1972. All sessions of the program at which contributed papers are presented were joint sessions of the Phycological Society of America and the Phycological Section of the Botanical Society of America. Various research papers were presented at the annual meeting. Section one was on Nuisance Algae and Bloom Phenomena. Section two was on Physiology and Biochemistry.