Freshwater Algae 11a 



A glance at the table shows at once how little is known of Canadian Fresh- 

 water Algae. Many of the species are recorded as being found in Canada for 

 the first time. My work has been handicapped to some extent by imperfect 

 library facilities. Certain papers dealing with the arctic flora, which I wished 

 to consult, I was unable to obtain. Hence it is possible that a few records have 

 been omitted from the table. 



There are recorded in the detailed account which follows: 28 species of 

 Myxophyceae from 17 genera; 137 species of Chlorophyceae representing 41 

 genera (Cosmarium 38 species, Staurastrum 22 species); and Phaeophyceae and 

 Rhodophyceae with 1 genus and 1 species from each group, making a total of 

 60 genera and 167 species. There are two new varieties, one new species, and 

 one species transferred from the genus Cosmarium to the genus Staurastrum. 



In concluding the general part of this report I wish to express my indebted- 

 ness to Professor A. H. Reginald Buller for encouragement and many useful 

 suggestions; to Dr. Theodor Holm for the Latin descriptions of new varieties 

 and species; to Professor W. A. Setchell for identification of Scytonema crusta- 

 ceum Ag. ; to Mr. Frits Johansen for much information regarding the collecting 

 of the material and the localities from which the samples were taken, and for 

 the loan of various publications; and, especially, to the late Professor G. S. 

 West of Birmingham, England, not only for valuable help and advice during 

 the earlier stages of the investigations recorded here, but also for the training 

 and stimulating influence which I received from him during a number of years 

 which I was privileged to spend in his laboratory. Professor West was par- 

 ticularly interested in arctic freshwater algae and was desirous of promoting 

 the investigation of Canadian algae in general. His untimely death in the 

 summer of 1919 was a great loss to the botanical world in general, and especially 

 to Canada, whose freshwater s are still practically unexplored. 



The following works were consulted regarding the distribution and for 

 other purposes: — 



Borgesen — Freshwater Algae of the Faeroes. 



Borgesen and Ostenfeld — The Phytoplankton of the Faeroes. 



Collins — The Green Algae of North America. 



Cooke — British Desmids. 



Cooke — British Freshwater Algae. 



Ralfs — The British Desmidieae. 



Saunders — The Freshwater Algae of the Harriman Alaska Expedition. 



Tilden — Minnesota Algae (Myxophyceae). 



West — British Desmidiaceae. 



Wolle — Desmids of the United States. 



WoUe — Freshwater Algae of the United States. 



Also "Meddelelser om Gronland," various volumes, and a large number 

 of small works by W. West, G. S. West, Borgesen and other workers. 



