Tilden: LIST OF freshwater algae. 235 



163. Porphyrosiplion iiotarisii Kg. Tab. Phyc. 2:7. 1850-52. 



Minneapolis, August 7, 1894. Coll. A. P. Anderson. 



164. Symplocamuscoruni GoMONTin Morot Jour, de Bot. 4: 



354. 1890. 

 In greenhouse, Minneapolis. November 23, 1894. 



165. Symploca luuscorum Gomont var. rivularis (Wolle) 



TiLD. Am. Alg. no. 67. 1894. 

 Minneax)olis, November 27, 1894. 



166. Lyngbya ochracea Thuret in Aun. des Sc. Nat. Bot. 



vi. 1 : 279. 1875. 

 State Fish Hatcheries, St. Paul. September 17, 1894. 



167. Lyngbya hinnulea (Wolle) Tild. Am. Alg. no. 69. 



1894. 

 In tank in Zoological laboratory. University of Min- 

 nesota, Minneapolis. November 27, 1894. 



168. Phormidium retzii (Ag.) Gomont in Morot Jour, de 



Bot. 4: 355. 1890. 

 Osceola, Wiscoilsin. September 24, 1894. 



169. Oscillatoria priiiceps Vauch. Hist. d. Conferves d'eau 



douce. 190. 1803. 

 Bridal-veil falls, Minneapolis. June 26, 1894. 



170. Oscillatoria limosa Ag. Disp. Alg. Suec. 35. 1812. 



State Fish Hatcheries, St. Paul. September 17, 1894. 

 Minnesota river. Fort Snelling. October 1, 1894. 

 In greenhouse, St. Paul. November 26, 1894. 



171. Oscillatoria anguina Bory Diet, class. d'Hist. nat. 



12:467. 1827. 



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



Second creek. Lake City, Wabasha county. Septem- 

 ber 4, 1894. 



172. Oscillatoria tenuis Ag. Alg. Dec. 2: 25. 1813. 



In tanks in Zoological Laboratory, University of Min- 

 nesota, Minneapolis. November 27, 1894. 



173. Oscillatoria tenuis Ag. var. natans (Kg. ) Gom. Ann. 



Sc. Nat. vii. 1(5:221. 1892. 

 Trout mere, Osceola, Wisconsin. October 8, 1894. 



174. Oscillatoria brevis Kg. Phyc. Gener. 186. 1843. 



St. Paul. November, 26, 1894. 



