236 MINNESOTA BOTANICAL STUDIES. 



175. Oscillatoria numidica Gomont Ann. Sc. Nat. vii. 



16: 231. 1892. 

 Minneapolis. In greenhouse, November 23, 1894. 



176. Spirulina subsalsa Oersted Beret, in Nat. Tidskr. 



17. 1845. 

 Twin lakes, Hennepin county. October 15, 1894. 



177. Bivularia echimilata Smith. 



Lake Chisago, Chisago county. July 26, 1894. Coll. 

 D. T. MacDougal and A. P. Anderson 



178. (jloeotrichia iiatans Rabenh. Deutsch. Krypt. Fl. 

 90. 1847. Minneapolis, August 17. 1894. 



179. Gloeotrichia incrustata Wood Prodr. Proc. Am. 



Phil. Soc. 128. 1869. 

 Lake Minnetonka, Hennepin county. August 25, 1894. 

 Coll. D, T. MacDougal. 



180. Tolypothrix distorta (Muell. ) Kg. Phyc. Gener. 



228. 1843. 

 Minneapolis. August 17, 1894. 



181. Nostoc spongiaeforme Ag. Syst. Alg. 22. 3824. 



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



182. Nostoc caeruleum Lyngb. Hydroph. Dan. 201. 1819. 



Parker's Lake, Hennepin county. July 28, 1894. 



183. Nostoc pruniforme (Roth) Ag. Disp. Algar. Suec. 45. 



1812. 

 Minneapolis. August 17, 1894. 



184. Anabaena circinalis Rabenh. Alg. n. 209. 1852. 



Lake Calhoun, Hennepin county. October 22, 1894. 



185. Anabaena oscillarioides Bory Diet, class. d'Hist. nat. 



308. 1822. 

 Second creek, Lake City, Wabasha county. Septem- 

 ber 4, 1894. 



BACILLARIEAE Nitzsch. Beitr. Infus. 1817. 



186. Navicttla cuspidata Kg. Bac. 94. 1844. 



Minneapolis. November 14, 1894. 



187. Navicula gibberula Kg. Bac. 101. 1844. 



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



