RAMULARIA NEGATOR, MASSEE. 

 (Disease of Seedlings of Cacao.) 



This fungus developed on the cotyledons of seedlings of 

 cacao from Dominica and Jamaica when the seeds were 

 planted at Kew ; the fungus was shown to have come from 

 the West Indies. The seedlings attacked by the fungus 

 finally died. 



Recently the death of seedlings of cacao in West Africa 

 has been reported to be caused by a fungus disease, and the 

 material forwarded to Kew showed that the fungus belonged 

 to the genus Ramulavia ; but from the material received it 

 was not possible to determine whether the species was 

 Ramulavia necator or not. 



Diagnosis: Sporodochia superficial, broadly effuse, 

 filamentous, white ; sterile hyphae creeping, densely inter- 

 woven, septate, hyaline, 7-10 microns wide, slightly 

 swollen here and there ; basidia erect, sparsely branched, 

 the ultimate branches attenuate ; conidia elliptic-oblong, 

 rounded at either end, 3-septate, scarcely constricted at 

 the septa, 25-28 by 7-9 microns. 



MASSEE : Kew Bulletin, 1907, pp. 243 and 298. 



Ramularia Goldiana, Sacc. has been reported to kill 

 the leaves and twigs of the coffee plant in Brazil. 



Diagnosis. Spots almost circular, with white and 

 reddish zones ; hyphae filiform ; conidia cylindrical, borne 

 in chains, hyaline. 



SACCARDO : Sylloge Fungorum, Vol. X., p. 554. 



DEMATIE^:. 



CERCOSPORA NICOTIANS, E. & E. 

 (Leaf Spot of Tobacco.) 



This disease is known in the United States, Sumatra 

 and Ceylon, and is considered in the two former countries 

 to cause much damage to the cultivation of the tobacco 

 plant. In Ceylon the disease is not regarded as being of 

 a serious nature, since practically no attention is paid to 

 the " wrapper leaf" cultivation. 



Diagnosis. Spots amphigenous, pale in colour ; hyphae 

 caespitose, 75-100 by 4-5 microns, septate; conidia 40-75 

 by 3-3'5 microns, hyaline, curved, often 6-septate. 



FETCH : Circulars and Agricultural Journal, Royal 

 Botanic Gardens, Ceylon, Vol. IV., No. 7, 1907. 



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