THE FUNGI WHICH CAUSE PLANT DISEASE 499 



C. cerei, Poll, is on Cereus; 



C. citri Maynag. on oranges; 



C. damnosa Pet. on pine; all in Italy. 



C. persicae Schw. is reported on young peach branches. 



Cytospora Ehrenberg (p. 483) 



Stroma superficial or erumpent, tubercular, with irregular 

 chambers; conidia elongate allantoid. 

 Ascigerous forms belonging to Valsa are 

 known. 



Some two hundred species, chiefly 

 saprophytes. 



C. palmarum Cke. is on palms. 



C. ceratophora Sacc. is the suspected 

 cause of a blight of Japanese chestnuts.^* 



C. acerina Aderh. causes disease of Acer in Europe.'" 



C. sacchari Butler is found on sugar cane in Bengal. 



Dothiorellina Bubak with the one species D. tankofi^ Bub. has 

 recently been described as the cause of disease of the mulberry.'" 



Fig. 344. — Cytospora. Sec- 

 tion through a stroma. 

 After Chester. 



Dothiorella Saccardo (p. 483) 



Pycnidia erumpent, on a stroma, leathery, ostiole papillate or 

 not; conidia' ovate or elongate. 



Some seventy species, chiefly saprophytes. 



D. ribis (Fcl.) Sacc, on a wide range of hosts =Diaporthe stru- 

 mella. See p. 279. 



Jir^m^^ 



Fig. 345. — D. mori. N, section of stroma, 0, conidio- 

 phores and conidia. After Allescher. 



D. mori Berl. and D. populi Sacc. are perhaps parasitic on Morus 

 and Populus respectively. 



An unidentified species is reported by Duggar on currant as 

 the cause of cane blight. Inocxilations using the conidia have 

 produced the disease. See also p. 283. 



