Connection between Host and Parasite 15 



Iph 



species 



Karsteii (1873) ia Myc. Fenn. (192) and, later (1885) in the 

 Act. Soc. Faun. Fl. Fenn. (196) described the Erysiphaceae oS. 

 Finland, and in 1884 Winter monographed those of Germany in 



Rabenhorst's Krypt. Fl. Deutschl. (394)- 



In 1887 the important work entitled the " Parasitic Fungi of 

 Illinois, Part 2, Erysiphcae'' by Burrill and Earlc appeared. It 

 would be difficult to praise this work too highly for the clear de- 

 scriptions of the species (28 in number), the careful enumeration 

 of the host-plants, and especially for the broad view shown in the 

 conception of what constitutes a natural species. Burrill's excel- 

 lent account of the North American species in Ellis and Ever- 

 hart's N. Amcr. Pyrenomycctes (1892) is based on the above 

 work, and contains some important additions. 



In 1893 Schroeter enumerated the Erysiphaceae in Cohn's 

 Krypt. Fl. von Schlesien, in 1896, Jaczewski published his "Mon- 

 ographic des Erysiphees de la Suisse" (176), and in 1897 Oude- 

 mans described the species found in the Netherlands (263). 



In 1S95 Harper's valuable work (160) on the history of the 

 development of the perithecium appeared. 



At the beginning of 1 899 Palla published his important paper 

 ^'Ueber die Gattung Phyllactiiiia." It is here pointed out that 

 Phyllactinia differs from the other genera in producing its haus- 

 toria from hyphae sent through the stomata of the host-leaf. As 



_k.B ^B- ^ ^H 



ery 



iph 



In Saccardo's " Sylloge Fungorum " (1882-1899) an enu- 

 meration of all the published species of the Erysiphaceae is given. 

 Meschinelli (248), in his w^ork on fossil Fungi, describes and fig- 

 ures a genus Erysiphitcs, with one species (= Erysiphe protogaea 

 Schmalh.) found on Ficiis kiewiensis in one of the Tertiary forma- 

 tions in Russia. 



General Remarks on the Connection between Host 



AND Parasite 



h 



In the Erysiphaceae, perhaps as much as in any group ot 

 fungi there has been, especially in the past, an undue multi- 



