THE FUNGI WHICH CAUSE PLANT DISEASE 553 



C. camelliae Mas. is on tea. 



C. antirrhini Stew.'^^ 



Spots depressed, elliptic or orbicular, often confluent, 3-10 mm, 

 acervuli numerous, crowded; stroma well developed; conidia 

 16-21 X 4 /i, straight or curved, ends rounded; conidiophores 

 short; setse abundant, dark brown, 50-100 /t, simple, mostly 

 straight and tapering uniformly to a subacute point. 



It attacks the stems and leaves of the cultivated snapdragon 

 producing sunken spots. 



C. cyclamense Hals, is on Cyclamen; 



C. dracsense Hals, on Dracaena; 



C. cofFeanum N. is on coffee; ^*' 



C. heveae Fetch, on Hevea in India; 



C. cradwickii Banc, on cacao pods; 



C. brachytrichum Del. on cacao leaves; 



C. theobromse A. & S. and C. theobromicolum Del. are on 

 cacao. 



C. incamatum Zimm. is on Hevea and vanilla; 



C. macrosporum Sacc. on vanilla; 



C. pollaccii Maynag. on Japanese loquot in Italy; 



C. hedericola Lau. on Hedera. 



Undetermined species of CoUetotrichum have been reported 

 on asparagus,^** carnation, ^^ pear,^* and many other hosts. 



Melanconiaceae-PhaBosporae (p. 537) 

 Conidia dark, continuous, globose to oblong or fusoid. 



Key to Geneka of Melanconiaceae-Phaeosporse 



Conidia solitary on the conidiophores 



Conidia globose or oblong 1- Melanconium, p. 554. 



Conidia fusoid, often arcuate 



Conidiophores not swollen at base 2. Cryptomela. 



Conidiophores swollen at base 3. Basiascum. 



Conidia in chains 



Conidial chains separate 4. TruUula, p. 554. 



Conidial chains in a mucose head 5. Thyrsidium. 



