554 THE FUNGI WHICH CAUSE PLANT DISEASE 



Melanconium Link (p. 553) 



Acervuli subcutaneous, conic or discoid, blacli; conidia elongate 

 to globose-oblong, erumpent in black masses; conidiophore sim- 

 ple. In part=Trichosphaeria. See p. 228. 

 More than one hundred fifty species. 

 M. fuUgineum S. & V. Cav.«^ 



Acervuli scattered or gregarious, at first gray-cinereous, then 



brownish, subepidermal, erumpent; conidia ovoid to ellipsoid, 



inequilateral, acute, 9-12 x 4-6 n, olive, guttulate; conidiophores 



filiform, from a well developed stroma. 



It causes the important bitter rot of ripening grapes, especially 



the white varieties, occurring also on shoots 



and peduncles. Acervuli appear on the 



surface of the rotted berries. The myce- 



Uum penetrates even to the seeds. 



Southworth suggested in 1891 ^'^ that 

 this and Gloeosporium are congeneric but 

 Atkinson ^^ who studied the fungus in pure 

 culture thinks them generically distinct. 



^°- ^7?.-~^:, fuligineum. Noack *^ who studied what he regarded as 

 After Atkinson. .,..,•,,,,.. , . . 



the typical M. fuligineum says that it is 



preceded by and belongs to a Gloeosporium-form. 



M. pandani L6v. is a common parasite on Pandanus in green- 

 houses, killing the branches. 



M. sacchaii Mass.^''' 



Acervuli numerous, collected in indeterminate pallid orbicular 

 spots; conidia cylindric, 10-15 x 3-4 fi, straight or slightly curved, 

 olivaceous, smooth. 



In leaves, sheaths and culms of sugar cane. The cause of the 

 rind disease. 



Trullula Cesati (p. 553) 



Acervuli subcuticular, erumpent, discoid-pulvinate, or conical- 

 depressed, black; conidia oblong-cylindric, catenulate; conidio- 

 phores long, bacillar, simple or branched. 



Some twenty species, of trifling economic importance. 



T. vanillse Hen. is on vanilla in Africa. 



