except those marked with an asterisk, presumably determined by 

 Professor Harvey unless otherwise stated. 



4. Species collected by various students while in the Univer- 

 sitv are either in the Harvey or the University collections. 



5. Species collected by Mr. E. D. Merrill, Washington, D. C., 

 while an undergraduate and graduate student at the University 

 of Maine, 1894-1899. Determinations by Professor Harvey 

 unless otherwise stated. 



6. Species collected by the author while an undergraduate and 

 graduate student at the University of Maine, 1896-1901. Deter- 

 minations made by the author unless otherwise stated, but only 

 after careful microscopical examination and comparison with 

 authentic specimens, as well as descriptions. Uredineae all veri- 

 fied by Dr. J. C. Arthur. Duplicates of most of the species col- 

 lected by Prof. F. L. Harvey and Rev. Jos. P>lake are also in the 

 authour's herbarium. 



The credit for the foundation of this work belongs to the late 

 Professor Harvey, and to him the author is greatly indebted for 

 assistance and inspiration in taking up this work. He is also 

 indebted to the following : 



To Mr. L. H. Harvey for access to his father's collection. 



To Messrs. J. B. Ellis, C. H. Peck, J. C. Arthur, E. A. Burt, 

 and W. G. Farlow for determination or verification of specimens. 



To Dr. Roland Thaxter for the loan of literature. 



The classification followed is that of Saccardo's Sylloge Fun- 

 gorum, the genera and species bemg arranged alphabetically. In 

 the case of parasitic species the hosts are given as far as possible, 

 but in some cases the determination of the host was not made 

 at the time of collecting and the material is such that it is impos- 

 sible to make it now. 



For the benefit of those who are not familiar with the lower 

 forms of plants it may be well to indicate briefly some of the 

 characteristics of the Fungi, giving as far as possible the common 

 names of the various groups into which the Fungi are divided. 

 The Fungi, popularly known under the names of moulds, mil- 

 dews, smuts, rusts, toadstools, and mushrooms, are plants : 



8 



