HEMILEIA 329 



Hemileia vastatrix has not been found either on Coffea 

 arabica (L.) nor on C. liberica (Hiern) when growing wild, 

 which proves that they have originally been infected in a 

 cultivated state by the fungus growing on some other wild 

 plant. 



Wild plants producing either Hemileia vastatrix or H. 

 Woodii, are as follows : 



Ceylon. Plectronia campanulata (Beddome), Coffea tra- 

 vancore?isis (Wight and Arn.). 



/ 



". ' h 



_a y& ! - ! 



Fig. 99. Hemileia vastatrix. 1, portion of a coffee leaf 

 showing diseased patches ; 2, a cluster of sori, slightly mag. ; 

 3, uredospores, highly mag. 



China. Gardenia jasminoides (Ellis). 



Java. Gardenia, two undetermined species. 



Africa. Coffea arabica (L.), var. Stahlmanii (Warb.), Cra- 

 terispermum laurinum (Benth.), Vangueria infausta (Soud.), 

 V. euonymoides (Schweinf.), V. madagascarensis (J. F. Gmel.). 



Queensland. Gardenia edulis (F. Muell.). Hemileia vas- 

 tatrix was recorded by Hennings as parasitic upon Coffea 

 arabica, var. Stahlmannii, in German East Africa. 



The following appeared in the Gardeners' 1 Chronicle, March 

 6, 1909, p. 153, under the heading, 'Disease resistant 

 Coffee': 'A new species, discovered growing wild on the 

 shores of the Oubanghi, Central Africa, by M. Dybowski, 

 and named C. congensis, which has been grown since 1903 in 

 the botanical garden at Ivoloina, has so far remained free 

 from disease [Hemileia]. Its market value is said to be fully 

 equal to that of the best qualities of Arabian coffee. Whilst 

 the present crop of C. congensis has not suffered from the 



