64 Kansas Academy of Science. 



best to give a list of all the specimens collected in the State, which by their number 

 indicate something of the relative abundance of the species. Third, to give the re- 

 sults of an examination of all the specimens for oospores. If no mention of oospores 

 is made immediately after the number of the specimen, it is to be understood that 

 the specimen was examined but none were found. Fourth, to give the classification 

 used by Schrceter in Cohn's Kryptogamen-Flora Schleseins, III Band., and adopted 

 by Berlese and DeToni in Saccardo's Sylloge Fungorum, Vol. VII. Since I know of 

 no American publication giving this classification, I have given descriptions of the 

 family, genera and sub-genera, for the most part simply translations from Sylloge 

 and Krypt. Flora. I have also included the extra limital genus Phytophthora, as it 

 is very probable that it will soon be known in the State. 



It will be noticed at once that several familiar names have been changed by this 

 classification, and that I have made a few innovations myself. It is hoped that the 

 reasons for the change given in each case will prove satisfactory. Two new species, 

 Peronospora Hedeomce, Kell. & Sw., and Per. Cynoglossi, Burrill, and one new variety P. 

 Cynoglossi, Burrill, var. Echinospenni Swingle, are described. 



It has not been found practicable to give any notes on the relation of the growth 

 of Peronosporaceoi to the humidity of the atmosphere, though several facts of interest 

 have been noticed. One point, however, may receive mention, as it has been scarcely 

 regarded by other writers on this group. That is the wintering of Peronosporacece 

 in young plants. It has been noticed for several years that some of the species could 

 be found very late in fall and early in spring, or even during mild weather in winter 

 on seedling plants. Sections through these affected plants showed an apparently 

 healthy mycelium, even during the coldest weather. It requires but a few days of 

 warm weather to produce a crop of conidia. It was also noticed that such parisitism 

 was very destructive to the host plants, a very large per cent, dying in early spring. 



Only the following species (all of the genus Peronospora, it will be noticed) have 

 been found passing the winter in seedling plants: Peronospora Arenariw, var. ma- 

 crospora, P. Arthuri, P. Corydalis, P. parasitica and P. Hedeomce. 



All of the thirty-two species included in this list were collected from August, 1883, 

 to October, 1889, by Prof. W. A. Kellerman or myself, unless otherwise specified. 

 The numbers given, unless preceded by the name of some collector, should be cited: 

 Kellerman and Swingle. 



The species are arranged in the genera, or subgenera, according to the host 

 plants — following Bentham and Hooker's Genera Plantarum. 



In all cases the original descriptions have been cited, and the more important 

 synonyms given. I have also given, in brackets following these citations, the refer- 

 ences to American descriptions, and to Saccardo's Sylloge. 



All of the specimens of any species collected on one plant are given immediately 

 after its name, and arranged according to the time of the year the collection was 

 made. These references to specimens give the number, date, and locality, and also 

 tell the part of the plant attacked. 



All of the numbers mentioned in this list are in my herbarium, and also that of 

 Prof. Kellerman. All of the species are in the herbarium of the Kansas State Agri- 

 cultural College. 



In conclusion, I thank Prof. W. A. Kellerman for the use of his books and collec- 

 tions, without which the list in its present form would not have been possible. To 

 Mr. J. B. Ellis, Dr. B. D. Halsted, Dr. T. J. Burrill, Prof. W. G. Farlow, Mr. W. C. 

 Stevenson, jr.. Prof. M. A. Carleton, Mr. E. Bartholomew, and Miss May Varney, I 

 owe thanks for many favors. 



I give in conclusion a list of writings and exsiccate containing references to 

 Kansas species. 



