52 



JOURNAL OF MYCOLOGY. 



on the under side of the leaf which is marked on the upper side with 

 corresponding rusty brown, indefinite spots. Conidia obclavate, sub- 

 acute at the ends, 4 — 7 septate, and sometimes constricted at the septa, 

 nearly hyaline, 30— 5(t x 4 



On leaves of JDiospyros Virginiana, S. Carolina (Kavenel.) 



82. Cercospoha velutina, E. & K. Bull. Torr. Bot. Club, XI, p. 122. 

 Amphigenous. Hyphse pale olivaceous, simple, continuous, more or 



less bent and toothed above, forming a dense, velvety growth over the 

 surface of little dark-colored tubercular swellings 1 mm. or less in diam- 

 eter, which are collected in groups or irregularly scattered over the sur- 

 face of the leaf. Conidia pale olive-brown, subequal or attenuated 

 above, curved, sparingly septate, 75—100 x 3 p-. 



On leaves of Baptisia, August, Kansas (Kellerman.) 

 b. Tufts effused. 



83. Cercospora Polygonorum, Cke. Hedwigia, March, 1878, p. 39. 

 Rav. Fungi Amer. 66. Ellis N. A. ¥. 549. Helminthosporium Hydropi- 

 peris, Thuem. M. U. No. 1087. 



Hyphse hypophyllous, loosely fasciculate, brown, sparingly septate. 

 75—100x 5—6/^, forming olive black suborbicular patches (i-l cm.) or 

 often continuous over the entire surface of the leaf which, if still young 

 and green when attacked by the fungus, shows on the upper surface pale 

 yellowish spots, indicating the position of the patches of hyphse beneath. 

 Conidia cylindrical, 3 — 5 septate, with a slight fuscous tint, 50 — 80x7 — 9/^. 



According to the description in Hedwigia this should be epipliyllous. 

 but all the specimens in the three collections cited show the fungus on 

 the lower surface of the leaves. There is a slight discrepancy between 

 the description in Hedwigia and that given by De Thuemen in M. U., 

 but the specimens are certainly the same. We have not found conidia 

 with more than 6 septa, generally 3 — 5. We can not say with certainty 

 whether De Thuemen's specific name should have preference. Cent. XI, 

 (Mycotheca) was issued in 1878, but whether before or after the March 

 ]S"o. of Hedwigia, we cannot say. 



84. Cercospora nigricans, Cke. Grev. XII, p. 30. 



Hyphse epiphyllous, fasciculate, short, brown, forming indeterminate, 

 irregular, dark colored patches. Conidia cylindrical or slightly attenu- 

 ated above, 3—5 septate, hyaline, 40—60 x 2 p-. 



On leaves of Cassia obtusifoUa, S. Carolina (Ravenel.) 



The fungus appears at first as groups of minute, yellowish pustules 

 (much resembling an Entyloma to outward appearance) soon becoming- 

 brown in the center and finally overspread with the dark brown hyphse. 

 There are no definite spots. 



85. Cercospora OLivACEA { B. &Rav.) Helminthosporium oUvaceum, 

 Berk. & Rav. Grevillea III, p. 102. C. Berkeleyi, Cke., Grev. XII, p. 

 30. C. Seymouriana, Winter, Bull. Torr. Bot. Club, X, p. 50. C. olivacea, 

 (B. & Rav.) Rab.- Winter, Fungi, 2974. 



