NORTH AMERICAN CERCOSPOR^. 



35 



grayish below, generally concentrically zoned, not very definitely limited. 

 Tufts of hyphae minute, ampliigenous, scattered. Ilyphse fasciculate, 

 not at all or only slightly toriilose sparingly and remotely septate, 

 fuscous, generally 110—180 long, 5— 6 P- thick but sometimes elongated 

 to 1 mm. long. Conidia filiform, subclavate. L e. gradually attenuated 

 upwards from the slightly thickened base, hyaline, multiseptate, brown- 

 ish, reaching even 170 !>- long, 5— 5i thick. 



On Crotalaria sagittalis, Missouri (Demetrius.) 



41 Cercospora Diodes, Cke. Grev. VII, p. 34. Rav. F. Am. 293. 



Hyphse epiphyllous, fasciculate, septate, fuscous, on round, deter- 

 minate, rusty brown spots, (2—3 mm.) Conidia cylindrical, slender, 

 hyaline, 50 x 3 p-.. 



On leaves of Diodia teres, S. Carolina (Ravenel.) 



42. Cercospora ros^cola. Pass, in Thuem. M. U. no. 333. Sacc. 

 Myc. Ven. 1249. i^^. A. F. 1255. 



Spots round, gray-brown (H — 2 mm.) border dark brown. Hyphse 

 amphigenous (mostly epiphyllous), dark, subcontinuous, subnodulose 

 above, 20—50 x 4— 4i collected into small, dense, hemispherical tufts. 

 Conidia cylindrical, slightly attenuated above, nearly straight, 3—5 sep- 

 tate, 30—60 X 3i— 4 P. 



On leaves of roses. 



43. Cercospora microsora, Sacc. Mich. II, p. 128. Cercospora 

 Tiliop, Pk. Bot. Gaz. YI, p. 277. 



" Spots small, numerous, suborbicular, brown with a paler center. 

 Hyphse tufted, hypophyllous, minute. Conidia bacillary, brownish or 

 cinereous, 3—5 septate, 25—40 x 3i— 4 P. The center of the spots on the 

 upper surface is sometimes tinged with reddish brown, on the lower sur- 

 face with cinereous." 



On living leaves of Tilia Americana, June, Vermont (Pringle.) 



We have seen no specimens of Prof. Peck's species, but the charac- 

 ters quoted above agree so well with the description of G. microsora, 

 Sacc, and with the specimens in Fungi Gallici 2032, and Rab.- Winter F. 

 E. 2781, that there can be little doubt of its being this species. 



44. Cercospora Magnolia, Ell. & Hark. Bull. Tor. Bot. Club, VIII, 

 p. 27. :N^. a. F. 643. 



Spots suborbicular, minute, less in size than the head of a pin, visi- 

 ble on both sides of the leaf and surrounded by a dark, raised border. 

 Hyphae fasciculate, erect, septate, nearly black, 25—40 M high. Conidia 

 obclavate, 3—5 septate, 20—40 P long. Only 3 or 4 tufts of hyphse grow 

 on each spot. 



On living leaves of Magnolia glauca, ISTewfield, J. 



45. Cercospora Eupatorii, Pk. 33d Rep. oS^. Y. State Mus. p. 29. 

 "Spots at first small and pale green, then larger, suborbicular, deter- 

 minate, reddish-gray or reddish- brow^n, with an elevated margin and 



