Davis — Parasitic Fungi in Wisconsin — III. 267 



phae. The leaf surface becomes dotted with black, globose to 

 hemispherical, sclerotioid bodies apparently connected with the 

 same mycelium. Macroseopically this fungus suggests a young 

 Erysiphea. Its systematic position is not clear. 



Cercospora camptosori n. sp. 



Spots subcircular to angular, pale brown becoming dark brown 

 with age, immarginate, 3-7 mm. in diameter; conidiophores am- 

 phigenous, more or less fasciculate, brown, usually undulate, nod- 

 ulose or bent, sometimes 1-2 septate, 18-57 x 3-4/* ; conidia hya- 

 line, obclavate-cylindrical to flagellif orm, straight, 40-100 x 3/*. 

 On Camptosorus rliizophyllus. Marquette State Park, Grant 

 County, Wisconsin. August 1st, 1914. This differs from Cer- 

 cospora phyllitidis Hume, as described, in the shorter conidio- 

 phores. 



Cercospora muhlenbergiae Atk. On Muhlenbergia sylvatica. 

 Kenosha County. 



Cercospora comandrae Ell. & Dearn. On Comandra umbel- 

 lata. Trempealeau. Curved and nodulose conidiophores are 

 not infrequent. 



Cercospora sanguinariae Pk. On Sanguinaria canadensis. 

 Phlox. 



Cercospora erysimi n. sp. 



Spots pallid, subcircular, 3-5 mm. ; conidiophores amphigen- 

 ous, fasciculate, fuligineous, simple, straight or somewhat in- 

 curved, 30-55 x 3-4/* ; conidia straight, obclavate, fuligenous 

 tinted, about 5- septate, 45-75 x 3-4/*. On leaves of Erysimum 

 cheirantlioides. Alma, Wisconsin, August 13th, 1914. 



Cercospora condensata E. & K. On Gleditsia triacanthos. 

 Marquette State Park near Wyalusing. Conidia up to 110/* in 

 length were noted. 



Cercospora negundinis Ell. & Evht. On Acer Negundo. 

 Galesville and Alma. In this collection the conidia are hypo- 

 phyllous ; the conidiophores range to 40-50/* and the conidia to 

 150/* in length. As many as 9 septa have been observed in the 

 latter. The conidiophores are mostly scattered or in twos and 

 threes. Also collected in Grant County with amphigenous 

 conidia and at Bridgeport. 



