6 A CATALOG OF ILLINOIS ALGAE 



uted among 34 genera, the largest single study of Illinois diatoms 

 thus far to appear. Other notable lists are those of Briggs (1872B) 

 and Jelliffe (1893), who reported respectively 23 genera and 45 spe- 

 cies and 21 genera and 26 species, mainly of diatoms. In a more recent 

 study, Ahlstrom^ (1936) listed 41 species and varieties, mainly dia- 

 toms, from Lake Michigan at Evanston. Skvortzow (1937) pubhshed 

 a list of 17 species and varieties of diatoms from Lake Michigan, 2 

 varieties and 1 species being descriptions of forms new to science. 



Only one paper in this group involves algae from the rivers bound- 

 ing Illinois. Bailey (1845) published "Notes on the Infusoria of the 

 Mississippi River," the first paper known to the writer to mention 

 algae from Illinois or its boundary waters. Nine genera and 14 species 

 of algae were listed. 



The remaining 27 papers in this group, dealing with algae of inland 

 waters, include 10 publications which appeared prior to or during 

 1900 (Clinton 1894; Carman 1890; Hempel 1896, 1898; Hazen 1899; 

 Hedgecock and Hunter 1899; Johnson 1894; Johnson and Atwell 

 1890; Kofoid 1898, 1899, 1900). The majority of these papers give 

 but brief notes of the algae, the most noteworthy being that of John- 

 son and Atwell, who investigated the algal flora of northwestern 

 Cook County and reported the occurrence of 38 genera and 102 spe- 

 cies and varieties distributed among three algal classes, mainly Chloro- 

 phyceae. The papers of Kofoid are notable, as they include the orig- 

 inal descriptions of some of our most frequently found algae. Pleo- 

 dorina illinoisensis Kofoid was first described (1898) from the 

 plankton of the Illinois River and was followed (1899, 1900) by the 

 description of Platydorina caudata Kofoid, collected from the same 

 stream. Accompanying these descriptions is the mention of a few 

 associated plankton species. 



Publications since 1900 include some of the most important tax- 

 onomic treatments of Illinois algae thus far to appear (Britton 1940, 

 1942; Marshall and Hague 1938; O'Hanlon 1929; Solheim and Pen- 

 found 1927; Tiffany 1927, 1939; Transeau 1912, 1913A, B, 1914, 

 1915, 1934, 1938; Transeau and Tiffany 1919; Transeau, ei a/. 1934). 

 Of these the outstanding and most comprehensive study is that of 

 Transeau (1913B), who published an annotated list of 72 genera and 

 242 species, varieties and forms of algae from Coles and neighboring 

 counties. Transeau (1912) recorded Gloeotaenium loitleshergerianum 

 from Coles County and followed (191 3A) with the complete life his- 

 tory of this alga, previously unknown in North America. Transeau 

 (1914) described 20 new species and varieties among the genera Mou- 



^ In this study of the deepwater plankton of Lake Michigan, Ahlstrom states that 

 most of the deepwater forms were also found in the inshore areas studied in Evanston. 

 In this catalog only those forms definitely stated as occurring at Evanston are in- 

 cluded. 



