476 DISEASES OF CULTIVATED PLANTS 



Diseased fruit should be removed, and the plants sprayed 

 at intervals with sulphide of potassium. 



Cooke, M. C.^Journ. Roy. Hort. Soc., 1904, p. 159. 



Cladosporium elegans (Penzig.) forms minute, blackish tufts 

 on dry, bleached spots on living orange leaves in Italy. 



Conidiophores wavy, septate, brown; conidia continuous 

 or i-septate, elliptic-oblong, granulated, pale brown, i8-2oX 

 5-6 JA. 



BRACHYSPORIUM (SACC.) 



Hyphae rigid, almost simple, coloured; conidia ovoid or 

 piriform, coloured, 2-5 septate. 



Often growing on wood. A very doubtful genus. 



Seedling pea blight (Brachysporium pisi, Oudem.) some- 

 times destroys young pea plants (Ptsum sativum). Blackish, 

 mouldy patches appear on the leaves, which become yellow, 

 and soon die. 



Tufts effused, delicate, blackish, conidiophores smoky, 

 solitary or clustered at the base, septate, smooth or somewhat 

 torulose near the septa, 100-250X5-6 //.; conidia solitary, 

 elliptical, 3-septate at maturity, constricted at the septa, 

 smoky, 28-30 x 11-12 p, epispore densely echinulate under a 

 high power. 



This appears to be a species of Heterosporium in reality. 



Oudemans, Nederl. Bot. Ven., 1898, p. 527. 



RAMULARIA (UNGER) 



Parasitic. Hyphae simple or with short, scattered branch- 

 lets, the tips of which are furnished with minute, project- 

 ing points, bearing the i-many-septate, colourless or brightly 

 coloured conidia, which are sometimes produced in chains. 



Only differs from Ovularia in the septate conidia. 



Cacao seed disease. A batch of cacao seeds received at 

 Kew from Jamaica showed a disease soon after germination, 

 the cotyledons becoming covered with a dense white mould, 

 which eventually killed the seedlings. The fungus is a true 

 parasite, and has been named Ramularia necator (Massee). 

 As two distinct batches of cacao, received at different times 



