THE FUNGI WHICH CAUSE PLANT DISEASE 561 



spots but since diseased tissue soon drops out they are often diffi- 

 cult to find. Bark spots are often sterile. Late in the season spores 

 abound scattered on the surfaces of twigs, especially at rough 

 places, as near leaf scars. Spores near bud scales penetrate them 

 with a mycelium and kill the buds or if on bark they enter the 

 twig and produce dead spots. 



C. foliicolum Fuckel.^o^ 



Spots epiphyllous, ochraceous, indefinite; acervuli punctiform, 

 erumpent; conidia ellipsoid-oblong, 17 x 6-7 /i, 3-septate, con- 



FiG. 378. — C. beijeiinckii. Longitudinal section of a pustule. 

 After Smith. 



stricted- at the septa, olivaceous, lower cell subhyaline, stalk 

 subhyaline, 15-20 x 1.25 /*. 



It is present as a saproph3i;e on apple leaf spots and causes 

 cankers on twigs and branches. 



C. camellise Mas. is reported on cultivated Camellia. 



C. mori Namura causes mulberry twig blight in India. ^* 



The Melanconiacese-Hyalodictyse and Melanconiacese-Phseod-' 

 ictyae containing only three genera have no parasitic species of 

 importance. 



Melanconiaceae-Scolecosporse (p. 537) 



Conidia cylindric, filiform or suballantoid, hyaline, mostly con- 

 tinuous. 



