Tilden: list of fresh- water algae. 229 



94. Spbaeroplea annulina (Roth) Ag. Syst. Alg. 76. 1824. 



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

 Conway MacMillan and D. T. MacDougal. 



ULOTRICHIACEAE (Kg.) Borzi em. De Toni, Syll. Alg. 1: 

 151. 1889. 



95. Hormisciaflaccida (Kg.) Lagerh. varnitens (Menegh.) 



Hansg. Prodr. 61. 1886-88. 

 Minneapolis. October 26, 1894. 



96. Hormiscia zonata (Web. and Mohr) Aresch. in Acta. 



Soc. Upsala. 12. 1866. 

 University springs, Minneapolis. April 7, 1894. 



97. Aphanochaete repens Berth. Unters. ueber d. Verz- 



weig. einig. Suesswasseralg. 1878. 

 Minneapolis. April 28, 1894. 



98. Chaetophora pisit'orniis (Roth) Ag. Syst. Alg. 27. 



1824. 

 Minneapolis. April 2, 1894. 



99. Chaetophora tuberculosa (Roth; Hook, in Ag. Syst. 



Alg. 27. 1824. 

 Taylor's Falls, Chisago county. August 11, 1894. 



100. Chaetophora monilifera Kg. Spec. Alg. 896. 1849. 



Osceola, Wisconsin. September 24, 1894. 



101. Chaetophora cornu-daniae (Roth) Ag. var genuina De 



Toni Syll. Alg. 1 : 187. 1889. 

 Marsh, St. Louis Park, Hennepin county. May 29, 

 1894. Coll. Conway MacMillan and D. T. MacDougal. 



102. Chaetophora calcarea Tild. Am. Alg. no. 11. 1894. 



Forming a calcareous crust 4. 5 mm. in thickness. 

 Lower cells 9 mik. in diameter, 3-5 times as long; 

 upper cells 8-12.5 mik. in diameter, twice as long. 

 Articulations distinctly contracted at joints. Ter- 

 minal cells usually rather blunt, sometimes ending 

 in very long, articulated setae. Completely cover- 

 ing sides of old wooden tank as far up as water line. 



Minneapolis. September 28, 1894. Coll. E. P. 

 Sheldon. 



103. Draparnaudia pluinosa (Vauch.) Ag. Syst. Alg. 58. 



1824. 

 Washburn Park, Minneapolis. August 18, 1894. 



