447 



of course there are a good manj^ spores from varions 

 fungi in the candelillo layer, so that it is rather difftcult 

 to say whether it is the candelillo which germinates. 

 Several times I got the same fungus, but never afungus 

 identical with the silverthread. 



.1 think I may be allowed from thèse investigations to 

 déclare that there is no identity beivveen candelillo and 

 silverthread. 



In the Annual Report of the Porto-Rico Experiment 

 Station for 1904 such a fungus is mentioned, which is 

 investigated by Clinton. Dr. Clinton kindly sent me 

 some dried speciemens from the Connecticut Experiment 

 Station Herbarium, where he is now employed. Thèse 

 leaves showed a close resemblance to the diseased ones 

 from Surinam trees; the aspect under the microscope of 

 small magnifying power is quite the same. In the Porto- 

 Rico climate, différent from that in Surinam, the fungus 

 shows exactly the same phenomena; I think thisstrengthens 

 the conclusion that candelillo is something différent from 

 silverthread; if it were identical, there would be a great 

 chance that the aspect and growth would be the same 

 under the almost similar circumstances in Venezuela and 

 Surinam. 



It may be still mentioned, that in Kew Bulletin 1893, 

 page 67, a note is found, that leaves, attacked by a similar 

 disease were sent from Jamaica to Kew by Cocker e 11. 

 Perhaps it is the same disease as that in Porto-Rico. 



Method of control. 



As the fungus grows almost entirely externally, the 

 best method to combat it is to spray with a fungicide. I 

 used 2o/o and 3% solutions of sulfate of copper; the 

 stronger solution gave good results, but the foliage was 



