THE 



Ohio Journal of Science 



PUBLISHED BY THE 



Ohio Statp; University Scientific Society 



Volume XVII MAY. 1917 No. 7 



TABLE OF CONTENTS 



Traxskau — The Algte of Michigan 217 



FoERSTE— Notes on Silurian Fossils from Ohio and Other Central States. . . . 233 

 (Concluded) 



HiNK^Descriptions of North American Tabanidse 269 



News and Notes 272 



THE ALGJE OF MICHIGAN.* 



Edgar Nelson Transeau. 



The following notes on the algce of Michigan are based 

 primarily upon collections made during the summer of 1915. 

 Under the direction of the Michigan Biological Survey, the 

 writer visited the ponds, lakes and streams on the west side 

 of the lower peninsula during the last week of May and the 

 first week of June. A second trip was made during the first 

 two weeks of August to Mackinaw and points on the northern 

 peninsula. The writer also' examined some collections made by 

 Mr. T. L. Hankinson in the course of his work on the fishes of 

 Michigan. Several collections from Isle Royale were furnished 

 by Dr. Wm. S. Cooper, and collections from the vicinity of 

 Douglas Lake were sent me by Dr. Alexander Ruthven, 

 Director of the Survey. 



The list includes only the species which could be identified 

 to the specific name. Many species belonging to the genera 

 Spirogyra, Zygnema, Nostoc and Oedogonium were present 

 in a vegetative condition. 



As no work on the algae of Michigan has been reported in 

 recent years, the records for species are for the most part 

 new to the state. 



*Contribution from the Botanical Laboratory, Ohio State University, No. 96. 



217 



