IOWA ACADEMY OF SCIENCES. 135 



NAIADACE.E. 



Potamogeton natans L. 



Lake Okoboji (Hitchcock). 

 P. lonchites Tuck. 



Spirit Lake (Hitchcock). 

 P. praelongus Wulf. 



Clear Lake (Hitchcock). 

 P. perfoliatiis L. var. Eichardsonii, Bennett. 



Lake Okoboji and Spirit Lake (Hitchcock). 

 P. zosterifolius Sebum. 



Lake Okoboji (Hitchcock). 

 P. mucronatus Schrad. 



Spirit Lake (Hitchcock). 

 P. pectinatus L. 



Woodbine (Burgess); Lake Okoboji (Hitchcock) 



CYPERACEAE. 

 Cyperus diandrus Torr. 



Near Lake Okoboji (B. W.). 

 C. SchicelnitziiToi'v. 



Lake Okoboji (B. W.). 

 Eleocharis acicularis R. Br. 



Sioux City (B. W.; L. H. P.). 

 Scirpus lacustris L. 



Council Bluffs (L. H. P. observations); Sioux City (B. W.). 

 8. atrovirens Muhl. 



Sioux City (B. W.). 

 Species of Carex numerous, bat omitted because they have 

 not been studied critically. There are also a large number of 

 grasses, localities and species will appear in another connection 



SOME NOTES ON CHROMOGENIC BACTERIA. 



L. H. PAMMEL AND ROBERT COMBS. 



Quite a large list of chromogenic bacteria are kaown to 

 bacteriologists. Many of these are familiar objects in bacteri- 

 ological laboratories. Of the early works describing these in 

 this country we may mention Sternberg and Trelease. For 

 later works on North American chromogenic bacteria we must 

 refer to Sternberg, Jordan and the numerous text books dealing 

 with pathogenic species. 



