450 



Giillaud gives as liis opinion, that the leaves die 

 because the hyphae attach theniselves very closely to the 

 cuticuhi of this leaf. Neither Cooke, nor Gallaud ever 

 saw hyphae penetrating the leaf tissue. 



EXPLANATION OF PLATES. 

 Plate VJI. 



FiG. 1. Branch of Liberian cofifee with a strand of the 

 silverthread fungus. 



In a the mycélium spreads over the leaf; the light- 

 coloured spot on the side of the leaf near the basis is 

 already dead. 



FiG. 2. Resuit of artifîcial inoculation. 



A myceliumstrand may be seen on the branch, the 

 withered leaf hangs by this strand [h). The other leaf 

 shows three brown spots. 



Plate VIIL 



FiG. 3. Stoma just killed by the fangus. The striped 

 part is dead. Magn. 400 y. 



FiG. 4. Stoma with a large number of cells already 

 dead. Hyphae penetrating the leaf tissue. Magn. 400 x. 



FiG. 5. The membrane on the leaf surface. Somewhat 

 simplified. Magn. 234 x. 



FiG. 6. Nodule of hyphae on a coffee branch in a pure 

 culture. Magn. 234 x. 

 FiG. 7. a—j. Typical myceliumforms. Magn. 234 X. 



a. to the left: anastomoses of hyphae; to the 



right: cells, resembling conidia. 

 h. short hyphae. 

 c. spirally twisted hyphae on agar. 



