100 
Ohio Naturalist. 
[Vol. 1, No. 6 
about twenty rods from the old patch. The soil is mainly clay with 
some loam, and has been cultivated and fairly well manured for 
many years. The ground slopes to the west and is well drained, 
though the lower portion is perhaps somewhat inclined to be moist. 
The plants made an excellent growth. The infection throughout 
was general, quite a large percentage of the stalks at this season 
being very black from base to tip with the almost contiguous sori or 
blotches of Rust. Why these thrifty young plants should be so 
thoroughly infected, as compared with the older ones but a short 
distance away which have for several years harbored the Rust, 
though rather sparingly, is not clear to the observer. 
A LIST OF KANSAS DESMIDS. 
John H. Schaffner. 
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, 111. 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. 
Crosterium 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. 
