The white Root-Fungus of Cinchona 



by 

 Dr. A. RANT. 



In an enumeration of the diseases and fungi peculiar 

 to the Cinchona tree ^) I gave at the time a description 

 of the two root-fungi, I had observed growing on the 

 plantations in Java. Thèse two fungi I distinguished as 

 the grey or external and the white or internai fungus, 

 as only the stérile mycelia were known hitherto. Both 

 diseases frequently occur on the same plantation and it 

 is only by examining the roots, that the separate causes 

 become manifest. In both cases the disease fîrst attacks 

 the dead or decaying stems of a wood-tree, whence it 

 gradually extends to the surrounding Cinchona trees. 



By means of pure cultures and infections I was able 

 to demonstrate, that the grey root-fungus, which possibly 

 belongs to the genus Rosellinia, produces Graphium as 

 lower fructification, both in nature and in pure cultures "). 



The white root-fungus, which mostly attacks trees of 

 older growth, rather than does the grey, is usually found 

 on Cinchona Ledgeriana Mo en s and Cinchona robusta 

 Trimen. Between the bark and the wood of a diseased 

 tree thin, tough, white layers of mycélium are found. 



') A. Rant. De Ziekten en Schimmels der Kina. Mededeelingen van 

 het Kina-proefstation. No. II, Buitenzorg, 1914. 



-) A. Rant. Der graue Wurzelpilz von Cinchona. Bulletin du Jardin 

 botanique de Buitenzorg. Deuxième Série, No. XXII, 1916. 



