416 FUNGUS-FLORA. 



Cercospora ferruginea. Fckl. 



Tufte thin, delicate, broadly effused ; hyphae very long, 

 slender, creeping, branched, septate, ferruginous ; conidia 

 variable in length, often very long, elongato-clavate, often 

 curved, 3-7-septate, brown, 40-100 X 6-7 /*. 



Cercospora ferruginea, Fckl., Symb. Myc., p. 354; Sacc., 

 Syll., iv. n. 2138. 



On the under surface of living leaves of Artemisia vulgaris, 

 also on species of Erigeron in Canada. 



Cercospora mercurialis. Pass. 



Spots rounded, silvery-white with a fuscous border ; tufts 

 minute, hypophyllous, gregarioup, often occupying the 

 central portion of the spots ; hyphae pale smoky, con- 

 tinuous, contorted, nodulose, short, 2040 X 5-6 /A ; conidia 

 cylindric rod-shaped, attenuated upwards, 2-7-septate, wall 

 thick, hyaline, 70-80 x 4-6 p., straight or slightly curved. 



Cercospora mercurialis, Passerini, in M. TJ., n. 783 ; Sacc., 

 Syll., iv. n. 2193. 



On living or fading leaves of Mercurialis perennis. 



** In woody Dicotyledons. 



Cercospora moricola. Cke. 



Hypophyllous ; spots orbicular, reddish-brown ; hyphae 

 fasciculate, short, olive ; conidia attenuated upwards, 3-4- 

 septate, hyaline, 70 x 3 /x. 



Cercospora moricola, Cke., in Eav. Amer. Fung., n. 587; 

 Sacc., Syll., iv. n. 2281. 



On leaves of Morus alia and M. rubra. 



*** 



On Monocotyledons. 



Cercospora concentrica. C. & E. 



Spots large, subcircular or elliptical, ferruginous, at 

 length greyish; hjphae fasciculate, pustulate, arranged 

 concentrically, flexuose, unbranched, continuous or septate, 

 12-20 x 4; conidia cylindrical, thinner towards the tip, 

 straight or curved, 3-5-septate, 40-70 x 3-4, reddish-brown 

 at maturity. 



