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. These two fungi I distinguished as the grey or external and the white or internal fungus, as only the sterile 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 first 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 2).