600 MINNESOTA BOTANICAL STUDIES. 



230. Gomphosphaeria aponina Kg. Phyc. Tab. l:pl.31.f.S. 



1845-69. 

 In tank in Botanical laboratory, Minneapolis. Octo- 

 ber 8, 1895. 



231. Cymbella gastroides Kg. Bacill. 73. pi. 6. f. .',. b. 1844. 



Pond, St. Peter. October 4, 1895. Coll. Henry Tilclen. 



232. Cymbella cymbiformis (Kg.) Brkb. Alg. Palaise. 49. pi. 



7. 1855. 

 St. Croix river, Osceola, Wis. August 26, 1895. 



233. Gomphonema olivaceum (Lyngb.) Kg. Bacill. 85. pi. 7. 



f. 13. 1844. 

 In Minnesota river. April, 1895. Coll. Conway Mac- 

 Millan, D. T. MacDougal, A. Foss. 



234. Cymatoplenra solea (Bri';b.) W. Sm. in Ann. Nat. Hist. 12. 



pi. 3. f. 9. 1851. 

 Chantaska creek, St. Peter. October 4, 1895. Coll. 

 Henry Tilclen. 



235. Synedra pulchella (Ralps) Kg. Bacill. 68. pi. 29. f. 37. 



1844. 

 Spring, J. H. R. Works, Red Wing. April 1, 1895. 

 Coll. A. A. Butler. 



236. Synedra ulna (Nitzsch) Ehk. Inf 211. id.n.j. J. 



1838. 

 Railway ditches, Osceola, Wis. August 28, 1895. 



237. Fragilaria virescens Raefs, var. prodncta Lagerst. 



Diat. Spetsb. 15. pi. 1. f. 1. 1873. 

 In a tank. Long lake, Hennepin county. September 

 4, 1895. Coll. B. T. Shaver and J. E. T. 



238. Cystopleuraglbba(EHR.)BE-ToNi. Syll. Alg. 2 : pt. 780. 



1892. 

 St. Peter. October 4, 1895. Coll. Henry Tilclen. 



239. Lysigonium varians (Ag.) De. Toni. Alg. Abyss. 1891. 



Railroad ditches. Osceola, Wis. August 28, 1895. 



