NORTH AMERICAN CERCOSPOR^E. 



21 



with an indefinite, dirty red-brown margin — or oftener on the brown 

 area appear many small, white, round spots which become at length 

 more or less confluent. HyphfB epiphyllous, fasciculate, brown, continu- 

 ous or sparingly septate, 40—60 x 4—5 /-'-, abruptly bent and crooked 

 above. Conidia oblong or cylindrical, 1—2 septate, 16—30 x 4 /^-, hyaline. 

 On leaves of Zinnia multiflora, Florida (Dr. Martin.) 



to. Cercospora Isanthi, E. & K. Bull. Torr. Bot. Club, XI. p. 115. 

 On round (1 mm.) white spots, with a narrow raised border. Hypha? 

 tufted (25 — 30 x 4 p-), crooked and subdentate above, continuous, brown. 

 Conidia clavate-cylindrical, multiseptate, 75 — 100 x 3 — 4 The spots 

 are at first purplish, with a purple shaded border but soon w^hiten out. 

 On leaves of Isanthus cceruleus, Manhattan, Kas. Aug. (Kellerman.) 



16. Cercospora crotontfolia, Cke. Grev. XII. p. 31. Rav. F. 

 Amer. 593. 



Hyphse epiphyllous, short or obsolete, on round, light colored defi- 

 nite spots (3 — 4 mm.) Conid-a cylindrical, straight, subobtuse, 1 — 3 sep- 

 tate, hyaline, 28—40 x 3 



On leaves of Croton glandulosum. S. Carolina (Ravenel.) This has 

 the general appearance of C. Chenopodii, Fres. 



17. Cercospora Reseda, Fuckl. Symbolse Myc, p. 353. iiT. A. F., 

 375. Virgaspovium maculatum, Cke., Grev. III. p. 182., id. lY. p. 69. 



Spots pallid, arid, round, (2 — 1 mm.) with a slightly raised, pale bor- 

 der. Hyphse amphigenous, csespitose, simple, continuous or faintly sep- 

 tate, nearly straight below but more or less crooked and irregular above, 

 fuscous, 50 — 70 X 4—5 /^-, forming little grayish tufts thickly scattered 

 over the central part of the spots. Conidia linear-obclavate, 4 -5 septate. 

 100—140 X 2i— 3 hyaline. 



On living leaves of Beseda odorata, Penn. (Martin.) 



18. Cercospora caj^escens, E. & M., Am. Xat. Dec. '82, p. 1003. N. 

 A. F., 1249. 



Spots brown, becoming gray and dirty white, suborbicular, irregular 

 and confluent [i — i cm.), mostly on dead portions of the leaf, mostly 

 with a narrow, definite, reddish brown border on the upper side of the 

 leaf. Hyphse csespitose, brown, 90—110 x 5—6 forming little black 

 tufts. Conidia obclavate-cyiiiidrical, 5—8 septate, hyaline 100 — 120 x 5 — 

 6 ,'J-, mostly epiphyllous. 



On leaves of Phaseolus (cult.) J^ewfield, J. 



19. Cercospora Yernoni^, E. & K. Am. I^at., Nov. '83, p. 1166. 

 Epiphyllous, on small (1 — 3 mm.) round, gray or purplish gray spots 



(which finally whiten out) with a distinct, narrow, raised border which 

 is surrounded by a purplish discoloration. Hyphse csespitose, subfuscous, 

 continuous, subnodulose and subdenticulate above, 25 — 40 x 4 — 5 

 Conidia slender, clavate, 6—9 septate, 75—100 x 3—4 



On leaves of Vernonia Baldwinii, Kansas (Kellerman.) 



