122 



Mycologia 



Septoria antirrhinorum sp. nov. 



Spots 1-2.5 mm - m diameter, usually circular, sometimes irregu - 

 lar, light-tan above and below, margins slightly raised; pycnidia 

 black, usually epiphyllous but sometimes hypophyllous, gregarious 

 at centers of older spots where they are clearly visible to the naked 

 eye, subimmersed, depressed globose, 60-120 fx in diameter; 

 conidia hyaline, slightly curved, aseptate, 20-30 X i-5>. 



On living leaves of Antirrhinum antirrhiniflorum (Poir.) 

 Small, Austin, Texas, Oct. 10, 191 5, B. C. Tharp. 



Septoria argemones sp. nov. 



Spots amphigenous, circular, almost black, 3-8 mm. in diam- 

 eter; pycnidia epiphyllous, scattered, immersed, black, spherical 

 to subovate, 60-80 /x ; conidia hyaline, curved, continuous, 18- 



23 X 1.5^- 



On living leaves of Argemone platyceras Link & Otto, Milano, 

 Texas, June 10, 191 6, B. C. Thar p. Causes a definite and often 

 serious leaf-spot, resulting in partial defoliation. 



Septoria asterina sp. nov. 



Spots purplish-black, at length with grayish-brown centers 

 above, rusty-brown below, 1-5 mm. or by confluence covering the 

 whole leaf; pycnidia pyriform, 130-200X110-175^ extending 

 through leaf, bases hypophyllous ostiola epiphyllous, spores fili- 

 form, undulate, faintly pluriseptate, 100-120 X 2.5 fi. 



On living leaves of Aster drummondii Lindl., Austin, Texas, 

 Fall of 1914, /. M. Lewis & B. C. Tharp. 



Septoria cercosporoides Trail. 



Spots at first show as mottled brown splotches 0.5-1 cm. or 

 more in diameter, brighter above than below, at length uniformly 

 brownish-black on both surfaces, but much more noticeable above, 

 surrounded by a more or less chlorotic zone, or by confluence 

 killing whole leaves ; pycnidia amphigenous, scattered thickly over 

 entire surface of spots, spherical, membranous, very light brown, 

 140-230^ in diameter; conidia hyaline, pluriseptate-guttulate, 

 cylindric to obclavate, 60-80 X 3 ft- Description in Grev. 15 : 

 109 gives pycnidia gregarious; elipsoid, 90X70 /a; sporules 

 50-60 X 2 fx. 



On living leaves of large cultivated Chrysanthemum, Denison, 

 Texas, Nov. 15, 191 5, B. C. Tharp. 



