HYPHOMYCETACEAE 439 



sparingly septate, straight, slightly tortuous upwards, 50- 

 70 X 4-5 /i, brown ; conidia acrogenous, narrowly obclavate, 

 4-5-septate, hyaline, 100-140X 2'5-3 /*. 



Cercospora viticola, Sacc, SylL, iv.. No. 2200. — Spots 

 appearing on both surfaces of the leaf, subcircular or 

 irregular, 2-10 mm. diam., often numerous and growing 

 into each other; hyphae often hypophyllous, in densely 

 fasciculate tufts, fihform, septate, 50-200X4-5 /*, straight, 

 ochraceous, apex obtuse and obsoletely denticulate ; 

 conidia elongate-obclavate, narrowed upwards, 3-4-septate, 

 guttulate, 50-70 X 7-8 yn, ochraceous-olive. 



Cercospora beticola, Sacc, Fung. Ven., sen v. p. 189. — 

 Forming spots on both surfaces of the leaf; spots vague in 

 form, dry, 2-3 mm. or more across, often bordered with 

 red ; hyphae fasciculate, often continuous, cylindrical, 40- 

 50X4-5 ft brownish, apex nodulose ; conidia acicular, 70- 

 120X3 ft densely and delicately septate, hyaline. 



Heterosporium, Klotzsch, Herb. Myc, i.. No. 67 (1832). 

 — Conidiophores fasciculate, simple or sparingly branched, 

 septate, often nodulose, olive-brown ; conidia solitary or in 

 chains of two or three, cylindric-oblong, 2-5-transversely 

 septate ; epispore minutely warted or granular, pale olive, 

 springing from the apex of the conidiophores. 



Growing on branches, twigs, and leaves ; often forming 

 blackish-olive, velvety patches. Helminthosporium only 

 differs from the present genus in the conidia having the 

 epispore smooth. 



Heterosporium echinulatum, Cke. — Clusters small, often 

 numerous, seated on brown spots usually on the upper 



