44 



breweries, sugar factories, paper mills, etc. Coker (1923) in 

 North Carolina reports that, "we have found the plant in 

 Chapel Hill not only in sewers but also rarely in such clean 

 streams as Battles' brook and the brook behind the athletic 

 field." Kevorkian (unpublished) on one occasion has collected 

 this form in clean streams in Arlington, Massachusetts. 



The conditions under which Leptomitus was found along 

 Goldstream Creek, Alaska appear to agree generally with the 

 majority of the previously reported cases. Although the water 

 contained no sewage or similar materials, organic substances of 

 another type were present in large quantities. It is in the floors 

 of the valleys of Central Alaska that the topsoil consists of muck 

 (peat) varying from a few feet to over one hundred feet in thick- 

 ness. The collection of Leptomitus reported above was made in 

 water containing large amount of suspended muck, and presum- 

 ably there were sufficient organic substances present in solution 

 to allow the plant to grow and develop. 



Literature Cited 



Amelung, H. 1931. Chem. Zeit. 41: 394. 

 Coker, W. C. 1923. Univ. of N. C. Press. 

 Corny, M. 1872. Ann. Sci. Nat. Bot. Series (5) 15: 5. 

 Humphrey, J. E. 1893. Trans. Am. Phil. Soc. 17: 63-148. 

 Kolkwitz, R. 1903. Ber. der Deut. Bot. Ges. 21: 147-150. 

 Petersen, H. E. 1911. Ann. Myc. 8: 499. 

 Radais, M. 1898. Bull. Soc. Myc. France 14: 144. 

 Tiegs, E. 1919. Ber. der Deut. Bot. Ges. 37: 496-501. 



Brooklyn College, Brooklyn, N.Y. 



