338 
shoots and fruit of infected trees, is almost of equal virulence as a 
destructive disease in the coffee plantations of Central America and 
Brazil, as is Hemileia vastatriz in similar situations in the old world, 
It is represented by specimens in the Kew Herbarium from Costa 
Rica, Guatemala, New Granada, Venezuela, Nicaragua, Dutch 
Guiana and Brazil. Up to the present the fungus causing this 
disease has been considered as belonging to the Hyphomycetes, one 
of the sections included under the term “ Fungi imperfecti,” and 
known as Stilbum flavidum, Cooke, with Stilbella flavida, Lindau, as 
a variant. 
The disease has been known to exist for many years past, and 
formed the subject of a report in the Kew Report for 1876, p. 21. 
In 1878 Dr, A. Ernst published an account of this disease along 
with others affecting the coffee plant. Up to this date the true 
cause of the disease had not been determined, and insects, fungi and 
climatic influences were respectively considered as primary causes. 
Tn 1880 Dr. M. C. Cooke correctly attributed the disease to the 
presence of a minute parasitic fungus which he described under the 
name of Stélbum flavidum. Under the title “Central American Coffee- 
disease” some account of the fungus is given in the Bulletin, 1899, . 
pp. 91-94, Somewhat similar blotches on the leaves are cause 
the mining larva of a small moth—Cemiostoma coffeellum (see Kew 
Bull, 1894, pp. 130-133). The Spanish name for this disease is 
* Manch t. 
a de hierro ” or iron spo 
= 8 forms scattered, circular whitish patches equally evident 
5 to 8 mm. (about a 
1 Sosrertte of being heavily loaded with fruit, but entirely destitute 
oie 9 at right angles to the long axis of the stem, imparting 
appears sh appearance when seen under the microscope, but it 
stem the ih hese under a pocket-lens. At the apex of the 
riform h ae ae diverge in every direction forming a broadly 
= those on the under side of the head bending downwards 
