46 Charles K. Bessep — 



17. Oscillaria princeps Vsxxch. Lincoln, July, 1891, (W.) 



18. Lyngbya mtuarii Liebm. Forming a reddish-brown coating upon the 

 ground near Lincoln, the soil probably somewhat saline. April, 1892, 



(Bessey.) 



19. Isactis fluviatilis (Rab. ) Kirch. Minden, (H.) 



Palmellace^e. 



20. Protococcus frustulosus (Carm.) D. Ton. In the basin of the artesian 



well, Lincoln, Dec. 1891, (S ) 



21. Protococcus vestilus Reinsch. In material collected by Dr. Hapeman 



at Minden, (C.) 



22. Raphidium braunii Naeg. In material from Minden collected by Dr. 



Hapeman, (C.) 

 22^. Raphidum polymorpkum Fries, var. aciculare A. Br. Minden, (H.) 



23. Tetraspora lubrica (Roth.) Ag. Minden, Coll. Hapeman, (W.) 



Cladophorace^e. 



24. ClaJophora glomerata (L.) Kuetz., var. simplicior Kuetz. Minden, Coll. 



by Dr. Hapeman. (W.) 



25. Draparnaldia plumosa Ag. Wahoo, (R.) 



26. Draparnaldia glomerata (Vauch.) Ag. var. genuina Kirch. In a pool. 



Lincoln, (W.) 



27. Chaetophora cornu-davuc (Roth.) Ag. var. polyclados Kuetz. Minden, 



Coll. Hapeman, (W.) 



Desmidiace^:. 



28. Desmidium aptogonium Breb. Minden, Coll. Hapeman, (C.) 



29. Closterium acerostim (Schr.) Ehrb. Lincoln, (C.) 



30. Closterium diance Ehrb. Lincoln, (C.) 



31. Closterium intermedium Ralfs. Minden, Coll. Hapeman, (C.) 



32. Closterium lanceolaium Kuetz. Lincoln, (W.) 



33. Cosmanum gotlandicum Wittr. Minden, Coll. Hapeman, (C.) 



34. Cosmarium botrytis Menegh. In material collected by Dr. Hapeman 



at Minden, (C.) 



35. Cosmarium portianum Arch. Minden, Coll. Hapeman, (C.) 



36. Euastrum pokornyanum Grun. In material collected at Minden by Dr. 



Hapeman, (C.) 



37. Staurastrum dickiei Ralfs. In material collected at Minden oy Dr. 



Hapemam, (C.) 



38. Staurastrum eustephanum (Ehr?) Ralfs. In material collected at Min- 



den by Dr. Hapeman, (C.) 



39. Staurastrum quadrangulare Breb. In material collected at Minden by 



Dr. Hapeman, (C.) 



Diatomace^e. 



40. Stauroneis lineata Kg. Agrees with Wolle's figure, but no description 



is accessible. In material from Minden, collected by Dr. Hape- 

 man, (C.) 



41. Stauroneis phanicenteron (Nitzsch.) Ehr. Lincoln, (C.) 



42. Navicula formosa Greg. Lincoln, (C.) 



43. Navicula hemiptera Kg. Crete, (C.) 



44. Navicula mutica Kg. Lincoln, (C.) 



