IOWA ACADEMY OF SCIENCES. 135 



NAIADACE^. 

 Potamogeton iiatans L. 



Lake Okoboji (Hitchcock). 

 P. lonchites Tuck. 



Spirit Lake (Hitchcock). 

 P. jwaelongus Wulf. 



Clear Lake (Hitchcock). 

 P. 2:>erfoliatus L. var. Mchardsonii, Bennett. 



Lake Okoboji and Spirit Lake (Hitchcock). 

 P. zosterlfoliiis Schum. 



Lake Okoboji (Hitchcock). 

 P. mucronatus Schrad. 



Spirit Lake (Hitchcock). 

 P. ijectinatus L. 



Woodbine (Burgess); Lake Okoboji (Hitchcock) 



CYPERACEAE. 



Cyperus dlandrus Torr. 



Near Lal^e Okoboji (B. W.). 

 C. ScJnceinitzu Torr. 



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.). 

 S. atrovirens Muhl. 



Sioux City (B. W.). 

 Species of Carex numerous, but 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 known to 

 bacteriologists. Many of these are familiar objects in bacteri- 

 ological laboratoa-ies. 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. 



