This text presents the subject using a systems approach and is therefore a departure from the more commonly employed phyletic approach. Topics covered include classification, cellular and sub--cellular organization, morphology and growth, reproduction and life cycles, evolution, phylogeny, physiology, ecology and the relationship between algae and man. All currently recognized algal divisions are covered, including the Cyanophyceae and the Prochlorophycota. Topics are treated in a concise and factual manner, each section providing an up--to--date review with extensive reference to key literature. The volume is profusely illustrated with line drawings and photographs, and synoptic tables aid the interpretation of the subject. An Introduction to Phycology is intended for use in undergraduate courses, but will also be a valuable reference text for postgraduates.