604 THE FUNGI WHICH CAUSE PLANT DISEASE 



C. herbamm (Pers.) Lk. var. citricolum.^*' *-" 

 Fawcett ^^^ recognizes this as the cause of scaly bark of Citrus. 

 The fungus was grown in pure culture and inoculations were made 

 resulting in from forty to sixty days in typical spots. From these 

 the fungus was re-isolated. 

 C. cucumerinum E. & A.^' ^s^-^" 



EfEused, maculose; in mass greyish-brown, changing to dark 

 olivaceous, forming spots on fruits; condiophores cespitose, 

 sparingly septate, simple, denticulate, pale; conidia ovoid, lemon- 

 shaped or fusoid; olivaceous, 10-13 x 3-4 /i. It causes watery 

 spots on cucumber leaves, also decayed spots in fruit. 



C. elegans Penz. is the cause of disease on various kinds of 

 oranges in Italy. This species is in the literature much confused 

 with the next. 

 C.citriMas.2*'' 288-291 



Conidiophores tufted, erect, branched, septate, brown, 30-75 

 X 2-4 p.; conidia fusiform, dusky, continuous, or 1 to 3-septate, 

 8-9 X 2.5-4 n. 



The cause of scab on lemons, sour oranges, satsumas and pom- 

 elos. It was grown in artificial culture by Fawcett. 

 C. carpophilum Thum.=«' '^^'^'- «» 



Spots orbicular, often confluent, blackish-green, forming circles; 

 conidiophores erect, simple, sinuous, septate; conidia 

 ovate, obtuse, continuous or 1-septate, 10-12 x 

 4-6 n. 



This is the cause of the widely distributed scab 

 of peach, plum, nectarine, apricot, cherry. The 

 deep olive-brown hyphae are found intermingled 

 with the hairs of the peach. The disease was first 

 noted in Austria in 1877. The fungus was cultured 

 carpophilum.' and inoculations were made by Chester.^^* 

 After Cobb. j^ ^j^g ^^g ^j^g fungus breaks the cuticle from 

 the layers below and its hyphse project through cracks. Upon the 

 leaf it causes shot holes. 

 C. sicophilum Far. attacks fig fruits. 

 C. fulvum Cke.'2 



Conidiophores densely crowded rupturing the cuticle, sparingly 

 branched, septate, nodulose, bearing a few conidia near the apex; 



