Tilden: list of fresh- water algae. 233 



140. Coelastrum microporuiii Naeg. in A. Braun. Alg. 



Unic. 70. 1855. 

 Minneapolis. April 2, 1894. 



141. Tetraspora bullosa (Roth) Ag. Spec. Alg. 1 : 414. 



1821. 

 Boston coulie, Lake City, Wabasha county. Septem- 

 ber 3, 1894. 



142. Tetraspora extensa Tild. Am. Alg. no. 48. 1894. 



Thallus 3-35 metres in length, narrow and ribbon-like, 

 measuring not more than 10 millimetres across, or 

 irregularly expanded with a diameter of 3 cm., gela- 

 tinous, verrucose, vivid green; cells spherical, ar- 

 ranged in groups of four, 10-12.5 mik. in diameter. 

 In tanks, current rather sluggish, temperature of 

 water 10 C. 



State Fish Hatcheries, St. Paul. August 8, 1894. 



143. Dictyospliaerium elirenbergianum Naeg. Einz. Alg. 



73. 1849. 

 Minneapolis. September 13, 1894. Coll. W. D. Frost. 



144 Palmella iiyaeforrais Kg. Alg. Exsicc. n. 102. 1833-36. 

 Minneapolis. August 10, 1894. 



145. Protococcus viridis Ag. Syst. Alg. 13. 1824. 



Minneapolis. November 23, 1894. 



146. Protococcus cinnaniomeus Kg. Spec. Alg. 202. 1828. 



Minneapolis. November 17, 1894. 



147. Protococcus iufusionuni (Schrank) Kirchn. Alg. 



Schles. 103. 1878. 

 State Fish Hatcheries, St. Paul. August 8, 1894. 



148. Protococcus infusionum (Schrank) Kirchn. var. 



roemerianuni (Kg.) Hansg. Prodr. 143. 1886-88. 

 Bass lake, Hennepin county. Apr. 23, 1894. Coll. 

 Conway MacMillan and D. T. MacDougal. 



149. Euglena Tiridis (Schrank) Ehrenb. in Leun. Syn. 



Thierkunde 2 : 1121 . 1886. 



State Fish Hatcheries, St. Paul. August 8, 1894. 



ZYGNEMACEAE (Menegh.) Rabenh. F1. Eur. Aigar. 2: 228 

 1868. 



150. Spirogyra porticalis (Muell.) Cleve. Svensk. Zyg- 



nem. 22. 1868. 

 Eden Prairie, Hennepin county. July 9, 1894. 



