437 



investigators: Ernst") speaks of a disease, which he 

 found in Venezuela and which iscalled there .,candelillo"; 

 it is identified by him with the „coleroga" of British-India, 

 studied by Cooke. 



Zimmermann') deals with a „spinnewebziekte" (cob- 

 web-disease) which exists in Java; an illustration is added 

 to the description, which shows a great likeness to the 

 silverthread 



In the Annual Report of the Porto-Rico Agricultural 

 Experiment Station for 1904, a similar disease is raentioned, 

 of which Earle gave the first description and which later 

 was investigated by Clinton. 



The question, whether we hâve in ail thèse cases the 

 same disease, will be dealt with in détail further on, 



I express my thanks to the agent of Royal West India 

 Mail at la Guayra for kindly sending me leaves attacked 

 by candelillo and to Dr. Clinton, who kindly gave me 

 some information on the subject. 



Description of the fungus, the culture-experiments 

 and artificial inoculations. 



a. Development and growth on the plant, 

 The fungus is to be seen only on the underside of the 

 leaves; in very rare cases one may see some hyphae 

 bending round the margin of the leaf and extending over 

 a small patch on the front, but then I always was able 

 to prove, that some leaves had touched each other, so 



i) A, Ernst, Botanischc Notizen ans Caracas, Botanischcs 

 Ccntralblatt, 1880, 1er Juhrgang, S. \ïl^. 



2) A, Z i m m e r m a n n, Eenige pathologische en physiologische 

 waarEemingen over kofiie, Mededeclingen uit 's landsPlautcntuin 67, 

 1904, pag. 46. 



