H. I. Collins; G. for A. J. Grout; H. for T. E. Hazen; J. for L. R. Jones; 

 O. for W. A. Orton. The number following the initial refers to the num- 

 bered herbarium specimen of the fungus in question. 



A list of this nature must of necessity be incomplete, and numerous addi- 

 tions will undoubtedly be made in the future. It is earnestly desired that 

 any such additional information, especially as regards the occurence of fur- 

 ther species and host plants, be communicated to us, accompanied, so far as 

 possible by specimens, which will be deposited in the University herbarium. 

 The work is being continued as rapidly as possible looking to a further pub- 

 lication, which will include the remaining groups of parasitic fungi. Nearly 

 every collection listed here is to be found in the herbarium of the University 

 of Vermont. The few exceptions are inserted on good authority, and the 

 location of the specimen on which the citation is based is indicated in each 

 case. 



The credit for the foundation of this work belongs to Professor L. R. 

 Jones, who has accumulated a large part of the specimens, notes and obser- 

 vations upon which this list is based. Large collections were made by Mr. 

 H. I. Collins, while a student at the University in 1890-92, and more recent- 

 ly by Dr. A. J. Grout and Mr. T. E. Hazen, while temporarily associated with 

 the Experiment Station. Several others have made less extensive contribu- 

 tions which are acknowledged in the list. I am under great obligations for all 

 such preparatory collections, as well as for the more immediate assistance 

 rendered by these persons. 



The work has been done in the botanical laboratory of the University 

 under the personal supervision of Professor Jones, to whom I am very 

 greatly indebted for assistance received at every point of the work. 



VV. A. O. 



University of Vermont, Burlington, Sept., 1898. 



PERONOSPOREAE. 



Bremia Lactucae Regel. {Pcronospora ganglioniformis. (B.) DeBy.) 



On Lactuca sativa, Lettuce. Occasionally destructive in green- 

 houses. Burl., Dec. 1891 ; J. 411. 



On Prenanthes altissima. Common. Burl., Aug. 1890; J. 410. 



Cystopus Bliti (Biv.) DeBy. 



On Amarantus retroHexus. Pigweed. Abundant. Burl, Aug. 

 1890; J. 402. 



Cystopus candidus (Pars.) Lev. 



On Capsella Bursa-pastoris, Shepherd's Purse. Very common. 

 Ikirl., Sept. 1890; J. ITA. South Hero, July, 1898; Waugh, 1757. 

 On Brassica campestris. V^ild Turnip. Pnirl., July, 1898; H. 1816. 



