114 Wisconsin Academij of Sciences, Arts and Letters. 



53. Phtllachora ulmi (Duv.) {Dothidea ulmi Fr.). 



Very common on leaves of Ulmus americana L., in fall and winter, 

 tbe ascospores forming on the fallen leaves; the spernaogonia 

 {Septoria ulmi Fr.) on the same host. 



54. Phyllachora trifolii (Pers.) {Dothidea trifolii Fr.). 



With its conidisi {Polythrinciuni trifolii Kze.), on Trifoliiim repens 

 L. and T. pr.:itense L. Common, in summer and fall. Madison, 

 Ithaca; La Crosse, Pammel; Sauk City, Liilers. 



55. Phyllachora graminis (Pers.) {Dothidea graminis Fr.). 



Common, on Asprella hystrix Willd., Dactylis glomerata L., Elymus 

 canadensis L., Panicum latifolium L. aad other grasses, in fall 

 and winter. Madison, Ithaca; Li Crosse, Pammel. 



56. MoNTAGNELLA HELiOPSiDis (Schw.) {Dothidea heliopsidis Schw.). 



What appears to be this species was found on the dead stems of 

 species of Helianthus and Aster, but sterile, as usual. 



57. Parodiella perisporioides (B. & C.) {Dothidea perisporioides B. & C.) ? 



On leaves of Desmodium acuminatum D C. La Crosse, Pammel. 

 What I have referred to this species appears as numerous minute olive- 

 brown or black dots, ,5 mm. or less in diameter, on the upper surface of the 

 leaves. These perithecia are smaller than those of any form of F. peri- 

 sporioides in my herbarium, and are pycnidial, containing numerous hya- 

 line round-oblong stylospores, eacli measuring 3-5/i, and With 1-3 oil 

 globules. 



58. HYPOMYCES LACTIFLUORUM (Schw.). 



Very common on one or more species of agaric, deforming the in- 

 fested plants, which are ultimately covered closely by the bright 

 cionabar-red perithecia. 



59. Gnomoniella fimbriata (Pa-s.) {Sphaeria flmbriata Pers.). 



On leaves of Carpinus americana Michx., in August. Pycnidia 

 ( Olaeosporium carpini Desm.) and ascosporic fruit. 



60. Gnomoniella coryli (Batsch) {Sphaeria coryli Batsch). 



On leaves of Corylus americana Walt, and C rostrata Ait., in sum- 

 mer. La Crosse, Kirkland, and Hokah, Minn., Pammel. 



61. Plowrightia morbosa (Schw.) {Sphaeria morbosa Schw.). 



Common, on stems of Prunus virginiana L., P. americana Mar- 

 shall, P. pennsylvanica L. and P. serotina Ehrh. Madison; Sauk 

 City, La Crosse, Pammel. 

 In May, when conidia are abundant on the forming knots, those of the 

 preceding year commonly have the protoplasm of their asci still undiffer' 



