18 



in the ground, but a few weeks afterwards the fundus was 

 found plentifully at the large plantations of the Natal Land 

 and Colonization Co., at Reit Valley, and afterwards at several 

 other places, so that the attempt to exterminate the pest proved 

 a failure. At that time so far as known to me these two species 

 of Hemileia were the only ones known to science, but a short 

 time since I received from the Director of Kew Gardens a 

 number of the Kew Bulletin, containing a monograph of the 

 genus Hemileia, showing that four species are now known and 

 described, and further that H. Woodii has been found at the 

 following places: Natal on leaves of Vangueria infausta, Burch. 

 V. latifolia, Sond, and V. euonymoides, Schwein, f ; at Bukoba, 

 Kilimandscharo on V. madagascariensis, J. P. Gmel ; Lindi 

 German East Africa; on Goffea Ibo, Froehner; Java, on various 

 species of Gardenia: Queensland, on Gardenia edulis, F. v. M, 

 At the commencement of the article in the Kew Bulletin, it is 

 said : — 



"It is somewhat remarkable that no attempt appears 

 " to have been made by those engaged in studying the life- 

 " history of Hemileia vastatrix, Berk, and Broome, the 

 " cause of the much dreaded coffee-leaf disease in Ceylon 

 " and elsewhere, to ascertain whether or not an Aecidium 

 "condition existed; the presence of both Uredo- and 

 " Teleuto-spore stages strongly suggesting the probability 

 " of the presence of such." 



This probability receives further support from the fact 

 that there exist " four species of Aecidium as yet not 

 " correlated with Uredo or Teleuto-spore stages, parasitic 

 " on the same or closely allied plants as those on which 

 " the various species of Hemileia are parasitic, and also 

 " occurring in the same countries as the latter." These 

 species are as follows : — 



Aecidium Vanguerice, Cooke, on Vangueria infausta, 

 Burch, and V. latifolia, Sond, Natal. "Often on the same 

 " plant, sometimes on the same leaves as Hemileia Woodii, 

 " K. & C." (Cooke, Grevillea, x. p. 124.) 



Aecidium Favettce, Berk, and Broome, and A.flavidium, 

 Berk, and Broome, on Pavetta indica, L. Ceylon. 



Aecidium Plectronice, Cooke, on Plectronia Gueinzii, J. 

 M. Wood, Natal. 



" Should heteroecism be proved to exist in the genus, 

 " the fact would be of value in any attempt to arrest the 

 " extension of parasitic species. Two species, Hemileia 

 " vastatrix, Berk and Broome, and H. Woodii, Kalchbr. 

 " and Cooke, are now known as parasites on species of 



