CERCOSPORA. 415 



CERCOSPORA. Fres. (fig. 24, p. 397.) 



Hyphae not rigid, simple or branched, brown, often 

 parasitic and forming spots on leaves; conidia elongated and 

 slender, brown or olive, rarely subhyaline, septate. 



Cercospora, Fres., Beitr., p. 90 ; Sacc., Syll., iv. p. 431. 



Virgasporium, Cke. 



Cladosporium and Helminthosporium of various authors (in 

 part). 



Distinguished by the vermiform septate spores. 



* On herbaceous Dicotyledons. 



Cercospora Bloxami. B. & Br. 



Forming pale orbicular spots, conidia elongato- fusiform, 

 acute at both ends, multiseptate. 



Cercospora Bloxami, B. & Br., Ann. Nat. Hist., n. 1979 ; 

 Sacc., Syll., iv. n. 2082. 



On fading leaves of Brassica napus and B. sinapis. 



Cercospora resedae. Fckl. (fig. 24, p. 397.) 



Forming minute grey, gregarious tufts on dry spots of 

 the leaf, 2 4. mm. diameter; hyphae densely crowded, un- 

 branched, continuous or sparingly septate, straight below, 

 subtortuous above, 50-70 x 4-5 /x, brown ; conidia borne at 

 the tips of the hyphae, obclavate-linear, 4-5 septate, hyaline, 

 100-140 x 2-5-3^. 



Cercospora resedae, Fuckel, Symb. Myc., p. 353 ; Sacc., 

 Syll., iv. n. 2092. 



Virgasporium maculatum, Cke., Grev., iii. p. 182, t. xlviii. 

 f. 4. 



On living leaves of Reseda odorata. 



Cercospora calthae. Cke. 



Spots orbicular, epiphyllous, brown ; hyphae short, hyaline ; 

 conidia cylindrical, somewhat attenuated, septa scarcely 

 distinct, 30-35 X 2 p.. 



Cercospora caltliae, Cke., Grev., xvii. p. 65 ; Sacc., Syll., 

 vol. iv. n. 7571. 



On fading leaves of Caltlia. 



