NORTH AMERICAN CERCOSPRO^. 



39 



microscopical characters. In all the specimens except those on Abutilon, 

 the spots at first present a peculiar dull, greenish, water-soaked appear- 

 ance which, though difficult to describe, is easily recognized when once 

 seen. 



We have thought it best, for the present at least, to refer all these 

 forms to C. altlmina, Sacc, though it is not absolutely certain that they 

 belong to that species. 



57. Cercospora aeruginosa, Cke. Rav. Fungi Amer. 68. 



Spots irregular, suborbicular (2— 3 mm.), rather inconspicuous and 

 indefinitely limited, brownish. Hyphse densely fasciculate, greenish, 

 short (35 /^-). Conidia cylindrical, attenuate above, 3— 5-septate, 60 x Si r-. 



On leaves of Bhamnus, South Carolina. 



58. Cercospora Galii, Ell. & Hoi. Jour, of Mycol., I, p. 5. 

 Mostly hypophyllous, on dead grayish-brown, definitely limited spots 



and areas of the leaves. Hyphse simple, continuous, brown, undulate 

 and geniculate above, 35—50 x 3—4 /^-, forming dense tufts arising from a 

 tubercular base. Conidia cylindrical, continuous (becoming septate), 

 brownish, nucleolate, 80—40 x 3i /^-, nearly straight. 

 On leaves of Galium Aparine, July, Iowa (Holway.) 



59. Cercospora Vici^, Ell. & Hoi. Jour, of Mycol. I, p. 5. 



On light brown, purplish bordered spots and irregularly shaped, dead 

 areas of the leaf. Hyphse densely tufted, continuous, brown, entirely or 

 slightly denticulate above, short (25—30 x 3—4 fJ-). Conidia cylindrical, 

 granular, becoming 3-septate, 30 — 40 x 3 — Si p-. Differs from (7. Lupini, 

 Cke., and C Phaseolorum, Cke., in its definitely limited spots. The 

 former also has the hyphse branched much as in C. racemosa, E. & M. 



On leaves of Vicia sativa, Iowa (Holway.) 



60. Cercospora zebrina. Pass, in Rab. F. E. 2277. 



Spots elongated in the direction of the nerves of the leaf, narrow, 

 nearly black, limited by the veinlets of the leaf. Hyphse simple, entire, 

 subflexuous above, smoky-brown. Conidia very long, attenuated above, 

 multiseptate, hyaline. 



On leaves of Trifolium agrarium, N. Y. (Peck.) 



61. Cercospora Garry^, Hark. Bull. Cal. Acad. Sci., February 

 1884, p. 38. 



''Hypophyllous ; spots irregular, pale. Hyphse pale brown, slender, 

 Conidia nearly linear, slightly attenuated above, hyaline, 7— 12-septate, 

 110 X 10 



On living leaves of Gavrya elliptica, Cal. (Harkness.) 



62. Cercospora Caulophylli, Pk. 33d Rep. . Y. State Mus., p. 30. 

 Spots irregular or suborbicular, dark brown or grayish, with a dark 



brown margin. Hyphse hypophyllous, tufted, flexuous, nodulose above, 

 colored, rarely branched. Conidia oblong or cylindrical, with 1—3 septa, 

 colorless, 20—30 x 7—8 p-. 



