A few years ago Prof. Lorenzo N. Johnson, of the University of Michigan, was at work on a monograph of the Desmids of North America, intending to make a comprehensive study of the American species; but his untimely death in the early part of the year 1897, prevented the fulfillment of this purpose. Some material which Prof. Johnson had received from Kansas proved very rich in species. Thinking that a list of the determined Kansas species would make a valuable addition to the Kansas flora, I have obtained the following list of forty-seven species which was kindly furnished by Mrs. Johnson, of Evanston, Ill. I have verified the names, and arranged the genera in the order followed in Engler and Prantl. Very few localities were given in the card catalogue from which the list was taken, and only a few others could be added which were taken from Prof. Johnson’s published articles. Family DESMIDIACEAE. PENIUM (Breb.) DeB. 1. P. margaritaceum (Ehrb.) Breb. CLOSTERIUM Nitzsch. 2. C. acerosum (Schrank) Ehrb. 3. C. areolatum Wood. 4. C. didymotocum Corda. 5. C. lanceolatum Ktz. 6. C. leibleinii Ktz. 7. C. lineatum Ehrb. 8. C. lunula (Muell.) Nitzsch., Topeka. 9. C. macilentum Breb. 10. C. rostratum Ehrb. 11. C. setaceum Ehrb. 12. C. tumidium Johnson, Burlington. PLEUROTAENIUM (Naeg.) Lund. 13. P. nodulosum (Breb.) DeB. 14. C. trabecula (Ehrb.) Naeg. COSMARIUM (Corda) Lund. 15. C. botrytis (Bory) Menegh. 16. C. conspersum Ralfs. 17. C. constrictum Delp. 18. C. contractum Kirch. 19. C. granatum Breb. 20. C. ornatum Ralfs. 21. C. porrectum Nordst., Burlington. 22. C. portianum Arch. 23. C. rectangulare Grun. 24. C. gotlandicum Wittr., Burlington; perhaps the same as the preceding species. 25. C. subcrenatum Hantzsch. 26. C. sulcatum Nordst. 27. C. triplicatum Wolle. PLEUROTAENIOPSIS Lund. 28. P. ovalis (Ralfs) Lund. ARTHRODESMUS Ehrb. 29. A. convergens Ehrb. XANTHIDIUM Ehrb. (Holacanthum Lund.) 30. X. antilopaeum (Breb.) Ktz. STAURASTRUM (Meyen) Lund. 31. S. arctiscon (Ehrb.) Lund. 32. S. crenulatum (Naeg.) Delp. 33. S. cuspidatum Breb. 34. S. echinatum Breb. 35. S. eustephanum (Ehrb.) Ralfs. 36. S. polymorphum Breb. 37. S. subarcuatum Wolle. EUASTRUM (Ehrb.) Ralfs. 38. E. binale (Turp.) Ralfs. 39. E. verrucosum (Ehrb.) Ralfs. MICRASTERIAS Ag. 40. M. furcata Ag. 41. M. rotata (Grev.) Ralfs. 42. M. radiosa (Ag.) Ralfs. 43. M. truncata (Corda) Breb. ONYCHONEMA Wallich. 44. O. laeve Nordst. SPHAEROZOSMA (Corda) Arch. 45. S. wallichii Jacobsen. HYALOTHECA Kuetz.