Taking advantage of the special interests of various phycologists, the 

 writer was fortunate in having certain genera determined by others : the 

 contributions of Dr. Francis Drouet, Dr. George J. HoUenberg, Dr. 

 Cheng Kwei Tseng, Dr. Francesca Thivy, and Dr. Ruth Chen-Ying 

 Chou are designated in the systematic portion of the text. 



To the scientists in whose care lie the algal collections chiefly con- 

 sulted abroad and at home, most grateful acknowledgement is made for 

 the hospitality of their institutions, in particular Dr. A. D. Cotton of 

 the herbarium of the Royal Botanic Gardens at Kew, and Mr. J. Rams- 

 bottom and Mr. Geoffrey Tandy of the herbarium of the British Mu- 

 seum (Natural History), Prof. Wm. Wright Smith and Dr. J. Mac- 

 Queen Cowan of the herbarium at the Royal Botanic Gardens, Edin- 

 burgh, Prof. Harald Kylin for the use of the fundamental herbaria of 

 C. A. Agardh and J. G. Agardh at Lund, Prof. Nils Svedelius of the 

 Botanical Institute at Upsala for the use of that rich collection. Prof. 

 Carl Skottsberg for the use of the herbarium at the Botaniska Tradgard, 

 Goteborg, and to Dr. F. B0rgesen, notable student of Caribbean and 

 Indian algae, for his great kindness in arranging for the study of the 

 algae at the Botanical Museum, Copenhagen. In this country particular 

 assistance has been rendered by Dr. W. A. Setchell and, after his death, 

 by Dr. H. L. Mason in loaning specimens from the University of Cali- 

 fornia herbarium, by Dr. John T. Howell in loaning his algae from the 

 Zaca Expedition in the herbarium of the California Academy of Sciences, 

 by Dr. Ira L. Wiggins for the loan of specimens, particularly from the 

 Hopkins-Stanford Expedition, in the herbarium of Stanford University, 

 by Dr. M. A. Howe and, since his death, by Dr. Fred J. Seaver for 

 specimens from the herbarium of the New York Botanical Garden, and 

 by Dr. D. H. Linder for specimens from the Farlow Herbarium. Many 

 of these botanists, and others, have in various ways given generous advice 

 and aid, particularly Dr. W. R. Maxon, Dr. G. M. Smith, Dr. G. J. 

 HoUenberg, and Dr. G. F. Papenfuss. The task of preparing the Latin 

 diagnoses was assumed by Dr. Hannah T. Croasdale, for which signal 

 service the writer is very grateful. 



Two considerable works on West coast algae developed while this 

 study was in progress and were brought to completion before it was 

 printed. Dr. E. Yale Dawson under Hancock auspices visited the Gulf 

 of California ; he generously permitted the author to see galley proofs of 

 his report, enabling a comparison to be made with that peculiar area. 

 Prof. G. M. Smith has developed a marine flora of the region of 

 Monterey, California, a much-needed study; he most kindly sent page 

 proofs of his text for the writer's use. Since the systematic part of the 

 present report was for the most part in typescript before these aids were 



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