NORTH AMERKJAN CERCOSPOR.^:. 



nndulate above. Cbnidia (mature?) subfascoiis, oblong-cylindric, 20—80 

 X 3—4 1— n septate. 



The tufts of hypliaj are very minute and meager, and are seen with 

 difficulty. The conida are not abundant. 

 On leaves of Ce2)haJ((nthus occidentalism Kansas (Kellerman). 



25. Cercospora Gymnocladi, E. & K. 1. c. 



Mostly epiphyllous on suborbicular, grayish brown spots (3— 4 mm.) 

 with a discolored border. Hyphse in minute punctiform tufts, simple, con- 

 tinuous, brown, 18—25 x 4 Conidia obclavate-cylindric, brown, 3—6 

 septate, 45—60 x 5—6 /^-, but often much shorter (25—35 /^), 2-3-septate 

 and occasionally constricted at the septa. 



On leaves of Gymnocladits Canadensis, Kansas (Kellerman). 



26. Cercospora omphakodes. Ell. & Hoi. Jour, of Mycol. I. p. 5. 

 Amphigenous but more abundant below, on round (5—6 r-) brown 



spots w^iich are mostly included in pale-brown dead areas of the leaf. 

 Hyphse brown, continuous or faintly septate, abruptly bent, subgenicu- 

 late and imperfectly dentate above, 60—75 x 3 ; conidia brownish, cyl- 

 indrical, mostly about 50—60 x 3—31 faintly 5—6 septate. 



On leaves of Phlox divaricata, ysli\ Laphami. Aug. Iowa (Holway). 



The specific name alludes to the tardy maturing of the conida which 

 remain for some time granular and faintly 1 — 2-septate. 



27. Cercospora circumscissa, Sacc, Eungi Ven., nov, Y. p. 189. 

 C. graphioides, Ell. In . A. F. 646. 



Spots round, rusty brown (3— 4 mm.) becoming pallid, w^ith a definite 

 concolorous margin surrounded mostly with a red shaded border. Hyphse 

 amphigenous but mostly hypophyllous, in slender, erect, black, bristle-like 

 fascicles scattered over the surface of the spots, subnodulose and subflex- 

 ous above (50—75 x 3 /^-) dark brown, continuous or faintly septate and 

 united below in a black tubercular base. Conidia obclavate, 50—75 x 3i— 

 4 mostly about 3-septate, black-browai. 



On leaves of Frunus serotina, Newfield, JS". J. Autumn. 



It is not absolutely certain that O. circumscissa, Sacc, and C. graplii- 

 oides, Ell., are the same, but the probability of their identity is so strong 

 that, for the present at least, we leave the latter as a synonym. 



28. Cercospora concentric a, C. & E., Grev. Y. p. 90. C. Yuccce, 

 Ck. Grev. YII. p. 35. Eav. E. Am., no. 290. 



Spots large, round or elliptical, ferrugineous, browai becoming gray. 

 Tufts erumpent in subcircinating, tubercular pustules which have been 

 found to be the perithecia of a Sphseria having biseriate, fusoid, hyaline. 

 1—2 septate, sporidia 12—15 x 2— 2i fJ-. allied to Diaporthe gloriosa, S. & S. 

 The hyphse of the Cercospora spring directly from these perithecia and 

 are short (12—20 x 4 !)■), brown, simple, and continuous, bearing conidia 

 at first hyaline and C5dindrical but at length quite distinctly reddish brown , 

 attenuated above 1--5 septate, and 40—70 x 3—4 !>-. 



