May, 1917] The Algce of Michigan 227 



Crucigenia rectangularis (A. Br.) Gay. Railroad ditches, New 



Buffalo, Ma}^ 31, 1915. Previously reported from Green- 

 land, Massachusetts and Illinois. 

 Scenedesmus bijugatus (Turp.) Kiitz. Carp Lake, Emmet 



Co., Aug. 9, 1915; Manistique, Aug. 11, 1915; New Buffalo, 



May 81. 1915. 

 Scenedesmus denticulatus Lagerheim. Carp Lake, Aug. 9, 



1915. 

 Scenedesmus obliquus (Turp.) Kiitz. New Buffalo, May 31, 



1915; Carp Lake, Aug. 9, 1915. 

 Scenedesmus quadricauda (Turp.) Breb. Manistique, Aug. 11, 



1915; Twin Lake, June 2, 1915; Carp Lake, Mackinaw, 



Aug. 9, 1915. 

 Dimorphococcus lunatus A. Br. Twin Lake, June 2, 1915. 



Not ])reviously reported from America. 

 Ankistrodesmus falcatus (Corda) Ralfs. New Buffalo, May 31, 



1915. 

 Ankistrodesmus falcatus var. spiralis West. New Buffalo, 



May 31, 1915. 

 Quadrigula closterioides (Bohlin) Printz. New Buffalo, May 



31, 1915; Twin Lake, June 2, 1915. Not previously 



reported from America. 

 Kirchneriella lunaris var. dianae Bohlin. Twin Lake, June 1, 



1915. 

 Oocystis elliptica West. Twin Lake, June 1, 1915; railroad pool, 



Manistique, Aug. 11, 1915. Not previously reported from 



America. 

 Oocystis crassa Wittrock. New Buffalo, May 31, 1915. 

 Nephrocytium agardhianum Nageli. Railroad ditch, Man- 

 istique, Aug. 11, 1915. 

 Nephrocytium obesum. West. Railroad ditch, Manistique, 



Aug. 11, 1915. Not previously reported from America. 

 Zoochlorella conductrix Brandt. Twin Lake, June 2, 1915, in 



Hydra. 



IIYDRODICTYACE.E. 



Pediastrum tricornutum Borge. Twin Lake, Muskegon Co., 

 June 2, 1915. Previously reported from Greenland. 



Pediastrum duplex Meyen. Trout Lake, Aug. 10, 1915. 

 Pediastrum duplex var. clathratum A. Braun. Trout Lake, 

 Aug. 10, 1915. 



