EXCLUDED SPECIES 



The following list of algae consists of species reported from Illinois 

 which the writer has been unable to place in the catalog with any de- 

 gree of certainty consistent with modern interpretations of the algae. 

 Most of these records are from the earlier Illinois reports and consist 

 mainly of old names involving considerable taxonomic confusion and 

 inconsistency of treatment by various workers. In the absence of the 

 specimen on which the records were based, it seems useless to retain 

 them as authentic records although it is perhaps possible some few 

 can be correctly interpreted by special students of certain algal 

 groups. Specialists have been consulted with regard to the excluded 

 species of diatoms, blue-green algae and the genera of the family 

 Zygnemataceae and the opinions of these specialists followed in the 

 exclusion of the listed species of these algal groups. These reports have 

 not been included in the totals of genera and species reported for the 

 State and recorded elsewhere in the catalog. The only data given are 

 the references to publications in which the species were reported. 



1. Aphanothece clathrata W. & G. S. West. (Britton 1940, p. 71.) 



According to Dr. F. Drouet the validity of this species is ques" 

 tionable. 



2. Cerasterias longispina (Perty) Reinsch. (Kofoid 1908, p. 34.) 



3. C. raphidioides Reinsch. (Kofoid 1908, p. 34.) 



4. Ceratium brevicorne Hempel. (Hempel 1896, p. 310; 1898, p. 330; 

 Kofoid 1908, p. 71.) 



5. Cladophora glomerata var. callicoma. (Solheim & Penfound 1928, 

 p. 86.) 



6. Conferva vulgaris Rab. (Johnson & Atwell 1890, p. 19.) 



7. Cylindrocapsa amoena Wolle. (Johnson & Atwell 1890, p. 19.) 



8. Dinobryon cylindricum var. angulatum (Seligo) Lemm. (Kofoid 

 1908, p. 78.) 



9. D. c. var. schauinslandii (Lemm.) Lemm. (Kofoid 1908, p. 78.) 



10. D. elongatum var. undulatum Lemm. (Kofoid 1908, p. 78.) 



11. D. sertularia var. alpinum Imhof. (Kofoid 1908, p. 78.) 



12. D. s. var. angulatum Seligo. (Hempel 1898, p. 323; Kofoid 1908, 

 pp. 74, 320.) 



13. D. s. var. divergens Imhof. (Hempel 1898, p. 232; Kofoid 1908, 

 pp. 74, 320.) 



14. D. s. var. stipitatum. (Kofoid 1908, pp. 74, 321.) 



15. D. s. var. undulatum. (Hempel 1898, p. 323; Kofoid 1908, p. 74.) 



16. Euglena minuta. (Agersborg 1930, pp. 109, 110, 113.) 



17. Gomphosphaeria lacustris Chod. (Daily 1938, p. '80.) 



According to Dr. F. Drouet the validity of this species is 

 questionable. 



154 



