Abstract
In this paper forty species of aquatic Phycomycetes are described from the vicinity of Cold Spring Harbor, Long Island, New York. Of these fungi, fifteen appear to be reported for the first time in this country, five have apparently not been mentioned in the American literature for twenty years or more, and four are seemingly new to science. In conclusion, the writer wishes to thank the Long Island Biological Association for the use of the facilities of that institution, Prof. H. M. Fitzpatrick for certain suggestions made by him, and particularly Prof. W. H. Weston, Jr., for his critical reading of the manuscript.