This book presents current research in the study of the ecology, economic uses and environmental impacts of algae. Topics include ultraviolet irradiation to control algal proliferation in the environment; alga Trachydiscus minutus as a new source of polyunsaturated fatty acids; systematics and taxonomic keys for the marine green algal family monostromataceae; the ecophysiology of soil algae; and an evaluation of the total phenolic content and antioxidant activities of crude extracts from red alga, Corallina elongata.