THE FUNGI WHICH CAUSE PLANT DISEASE 549 



C. carica S. & H/-"' «» 



Acervuli brown, becoming black, hemispherical, numerous, 

 small, 85-250 m, bearing 1-12 (or often 0) long, slender, irregular 

 setae which are dark throughout, acute, rigid, septate, 2-6 x 22- 

 106 IX, conidia regular, oblong, obtuse, 3.5-6.6 .\ 8.7-20; conidio- 

 phores slender, 1-2 x 45 ;u, hyaline. 



It is the cause of a decay of figs in the United States. 



C. ampelinum Cav. is on grape leaves. 



C. glceosporioides Penz. 



Acervuli sparse or scarcely gregarious, subepidermal, erumpent, 

 dark, cylindric, setse continuous or few-septate, dark colored, 

 40-90 X 5-6 n, conidia cylindric, straight, 16-28 x 4-G ii\ co- 



370. — C. carica. 5, conidiospores, spores and seta;, 4, black bodies 

 produced on germ tubes. After Stevens & Hall. 



nidiophores densely fasciculate, cylindric, rounded apically, 

 tenuous, 18-25 x 4-5 /i. 



It causes "wither tip" of orange, pomelo and lemon, "''"^''" spots 

 on citrus leaves, lime canker, and anthracnose of stem and flower 

 with great financial loss in Florida, West Ladies, South America, 

 Australia, Malta and many other localities. 



In "^'ither tip" the fungus enters through the terminal bud or 

 from leaves. On lemons attack is through bruises. Acervuli are 

 found on leaf, twig or fruit, breaking through the epidermis. 

 Cross inoculation on the various hosts and with the different forms 

 of the disease demonstrated the identity of all. Smith ^" has 

 questioned the casual relation of this fungus as regards "T\ather- 

 tip" as it occurs in California. 



C. falcatum Went. 



Acervuli poorly defined, setse irregularly arranged, cuspidate, 



