1893.] NATURAL SCIENCES OF PHILADELPHIA. 163 



Septoria mitellae E. & E. 



On leaves of Mitella diphylla, near the Mich. Ag. College. May, 

 16th, 1892. (G. H. Hicks.) 



Spots suborbicular or irregular rusty brown, becoming white or 

 whitish in the center, with a rather broad, reddish-brown margin, 

 2-4 mm. diam., often numerous. Peritheciaepiphyllous, black, sub- 

 prominent, scattered or sometimes only 1-3 in the center of the spot, 

 depressed hemispherical, 75-80// diam., pierced at the apex and 

 blackened around the orifice. Sporules acicular, hyaline, continuous, 

 straight or only slightly curved, acute, 15-22 x 1//. 



Septoria agropyri E. & E. 



On leaves of Agropyrum repens, Racine, Wis. July, 1892. 

 (Davis, No. 925.) 



Perithecia about 75,u diam., buried in the substance of the leaf 

 and only visible as minute, black specks on the upper surface. They 

 appear at first on narrow, pale yellowish strips soon confluent later- 

 ally and finally changing to a uniform brown color and occupying 

 a great part of the leaf. Sporules rod-shaped, slightly curved, ends 

 subacute, faintly nucleate, continuous, 18-25 x l?//, hyaline. 



Differs from S. gracilis Pass, on the same host, in its sporules 

 twice as large, and in its different habit. 

 Septoria purpureocincta E. & E. 



On leaves of Primus americana, Rockport, Kansas. Sept., 1892. 

 (Barthelomew, No. 709.) 



Spots amphigenous, irregular in shape, whitish in the center, with 

 a broad, shaded dark purple border above, rusty brown and without 

 any distinct border below. Perithecia epiphyllous, globose, open 

 above, 75-85// diam., brownish black, numerous, subprominent. 

 Sporules filiform, hyaline, 20-30 x 2//, with a row of very distinct 

 nuclei but not septate (in any of the specc. examined.) 



The character of the spots will easily separate this from any of 

 the other species on Primus. 



Septoria aurea E. & E. 



On leaves of Ribes aureum, Rockport, Kansas (Bartholomew, 

 No. 49), and Racine, Wis. (Davis, No. 9,037.) 



Spots amphigenous, greenish, definite, darker and mostly zonate 

 toward the margin, 2-4 mm. diam., often concave below. Peri- 

 thecia crowded in the middle of the spots, mostly hypophyllous, 80- 

 100// diam., subprominent, but innate in the substance of the leaf. 



