8 A CATALOG OF ILLINOIS ALGAE 



1908; Transeau 1913C, 1916) are of outstanding importance. Kofoid 

 published in 1903 the first volume of his widely-known pinoneering 

 study of the plankton of the Illinois River, including in Part I, 

 "Quantitative Investigations and General Results." This volume 

 contains mention of 35 genera and 25 species of algae, mainly diatoms, 

 from the Illinois River and lakes nearby and small streams of Fulton 

 and Mason Counties. In 1908, Part II, "The Constituent Organism 

 and Their Distribution" was published, this volume including data 

 on 76 genera and 138 species and varieties of algae, mainly Chloro- 

 phyceae and Bacillariophyceae from the Illinois River. 



Transeau (1913C) reported the results of a five-year study in East- 

 central Illinois of the periodicity of algae based on "their periods of 

 greatest abundance, the duration of their vegetative cycles and the 

 times of their reproduction." Twenty genera and 32 species and vari- 

 ties, mainly Chlorophyceae, were classed as winter annuals, spring 

 annuals, summer annuals, autumn annuals, perennials, ephemerals, 

 or irregulars. This paper was followed in 1916 by a similar report 

 based on a seven-and-one-half-year study of 27 genera and 60 species 

 and varieties of algae. 



Eddy published a series of papers resulting from his investigations 

 of freshwater algal communities. In 1925 he reported 22 genera and 

 2 species observed during a study of algal succession in ponds and 

 streams in Vermilion and Piatt Counties, and in 1927 (192 7 A) re- 

 ported 20 genera and 6 species found during similar investigations of 

 Crystal Lake and some small ox-bow ponds in the vicinity of the 

 University of Illinois, Urbana, Champaign County. Two papers ap- 

 pearing in 1931 (Eddy 1931 A, B) reported results of investigations 

 of the plankton of the Sangamon River and of a group of sink-hole 

 ponds in Pulaski County, respectively. These papers were followed 

 in 1934 with a summary of freshwater algal community studies, in- 

 cluding mention of 34 genera and 38 species and varieties of Illinois 

 algae. 



In addition to the work of Kofoid on the Illinois River is that of 

 Forbes and Richardson (1913), who reported 17 genera and 18 species 

 of algae found during their study of the upper portion of the river, 

 and who, in 1919, mentioned a few diatoms encountered in their 

 study of changes in the biology of the river after the opening of the 

 Chicago Drainage Canal. Leighton (1907) published an account of 

 investigations of the effect of Chicago sewage on pollution of the 

 Illinois and Mississippi Rivers, mentioning 40 genera of algae. Purdy 

 (1930) made an extensive study of the pollution of the Illinois River 

 and certain of its tributaries. Fifty genera and 17 species of algae 

 were recorded. 



Jewell (1920) reported 19 genera of algae from the Sangamon River 

 and in 1922 two genera from the Big Muddy River. The papers of 



