IOWA ACADEMY OP SCIENCES. 
135 
NAIADACE^. 
Potamogeton natans L. 
Lake Okoboji (Hitchcock). 
P. loncMtes Tuck. 
Spirit Lake (Hitchcock). 
P. %)vaelongu8 Wulf. 
Clear Lake (Hitchcock). 
P. ijerfoliatus L. var. Bicliardsonii, Bennett. 
Lake Okoboji and Spirit Lake (Hitchcock). 
P. zoster if ol ms Schum. 
Lake Okoboji (Hitchcock). 
P. mucronatus Schrad. 
Spirit Lake (Hitchcock). 
P. X)ectinatus L. 
Woodbine (Burgess); Lake Okoboji (Hitchcock) 
CYPERACEAE. 
Oijperus diandrus Torr. 
Near Lake Okoboji (B. W.). 
G. Scliioeinitzii Torr. 
Lake Okoboji (B. W.). 
Eleocliaris 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 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. 
