IOWA ACADEMY OF SCIENCES. 135 



NAIADACE^. 



Potamogeton natans L. 



Lake Okoboji (Hitchcock). 

 P. lonchites Tuck. 



Spirit Lake (HUchcock). 

 P. praelongus Wulf. 



Clear Lake (Hitchcock). 

 P. 2ierfoliafi(s L. var. Bidiardsonii, Bennett. 



Lake Okoboji and Spirit Lake (Hitchcock). 

 P. zosterifoUus Schum. 



Lake Okoboji (Hitclicock). 

 P. mucronatus Schrad. 



Spirit Lake (Hitchcock). 

 P. 2^ectinatus L. 



Woodbine (Burgess); Lake Okoboji (Hitchcock) 



CYPERACEAE. 



Oyperus diandrus Torr. 



Near Lake Okoboji (B. W.). 

 C ScJiweinitzii Torr. 



Lake Okoboji (B. W.). 

 Eleocliarls acicularis R. Br. 



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

 Scirims lacustris 'Li. 



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

 S. atrovirens Muhl. 



Sioux City (B. W.). 

 Species of Carex numerous, but omitted bec3i.us9 they have 

 not been studied critically. There are also a large nuoaber 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 kaowu to 

 bacteriologists. Many of these are familiar objects ia bacteri- 

 ological laboratcvries. 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. 



