HETEROECISM IN FUNGI 157 



susceptibility was induced through the injury to a leaf 

 caused by the attacks of the ' green fly ' (Aphis). 



Neger, F. W., ' Beitrage zur Biologic der Erysipheen,' 

 Flora, 90, p. 221 (1902). 



Marchal, E., * De la specialisation du parasitisme chez 

 VErysiphe GraminisJ Comptes Rendus, 135, p. 210 (1902); 

 136, p. 1280 (1903). 



Salmon, E. S., ' On Specialisation of Parasitism in the 

 ErysiphaceaeJ Beihefte z. Botan. Centralbl., 14, p. 261 

 (1903); idem, ii., The New Phytologist, 3, p. 109 (1904); 

 idem, iii., AnnaL Mycolog., 3, p. 172 (1905). 



Salmon, E. S., ' Infection-powers of Ascospores in Ery- 

 siphaceaej Journ. of Bot., 41, p. 159 (1903). 



Salmon, E. S., 'Cultural Experiments with the Barley 

 Mildew, Erysiphe graminis, DC.,' AnnaL Mycolog., 2, p. 70 

 (1904). 



Salmon, E. S., ' On E. graminis, DC., and its adaptive 

 parasitism within the genus Bromusj I.e., p. 255 (1904). 



Salmon, E. S., ' Cultural Experiments with an Oidium 

 on Euonymus japonicus, Linn, f.', I.e., 3, p. i (1905). 



Salmon, E. S., 'Cultural Experiments with "Biologic 

 Forms" of the Erysiphaceae] Phil. Trans., 197, p. 107 

 (1904). 



Salmon, E. S., 'Further Cultural Experiments, etc.', 

 Annals of Bot., 19, p. 125 (1905). 



HETEROECISM IN FUNGI 



The majority of parasitic fungi go through the entire 

 course of their development on a single host-plant ; such 

 are termed autoecious. On the other hand, a considerable 



