THE FUNGI WHICH CAUSE PLANT DISEASE 625 



F. camelliae Cat. on various hosts =Meliola camellia. See 

 p. 193. 



Sarcinella Saccardo (p. 616) 



Hyphae decumbent, septate, branched, dark; conidiophores 

 much reduced; conidia of two kinds: 1, dark packet-like; 2, sub- 

 hyaline falcate. Both are intermixed. 



A small genus chiefly conidial forms of Dimerosporium. See 

 p. 190. 



S. heterospora Sacc. on various hosts = Dimerosporium pul- 

 chrum. See p. 191. 



Dematiacese-Scolecosporse (p. 594) 



Conidia dark or subhyaline, vermiform or filamentose, multi- 

 septate. 

 There is only one genus. 



Cercospora Fries 



Conidiophores variable, almost obsolete or well developed, 

 simple or branched; conidia vermiform or filiform, straight or 

 curved, multiseptate, subhyaline to dark. 



In part =Mycosphaerella. See p. 243. 



The genus is a very large one, some seven hundred species, and 

 contains very many aggressive, important parasites, chiefly causing 

 leaf spotting. The spots are often blanched and are rendered 

 ashen colored in the centers by the presence of the dark hyphae. 

 The hyphae are usually geniculate at the point of spore produc- 

 tion, Fig. 427, and thus old hyphae bear traces of spores previously 

 borne. 



C. cerasella Sacc. on cherries =Mycosphserella cerasella. See 

 p. 245. 



C. gossypina Cke. on cotton =Mycosphaerella gossypina. See 

 p. 248. 



C. circumscissa Sacc. 



Spots amphigenous, circular, pallid, dry, deciduous; conidio- 

 phores fasciculate, nodulose, brownish, simple; conidia acicular, 

 narrowed apically, attenuate, tinged brown, 50 x 3.5-4 n. 



