Davis — Parasitic Fungi in Wisconsin — III. 263 



lowish becoming brown below, light green above, about !/2 cm - 

 in diameter, sometimes confluent ; asci hypophyllous, broad and 

 truncate or somewhat rounded at base, obtusely rounded at apex, 

 often more or less constricted in the middle, 30-36 x 18-26/a. 

 No stalk cell is produced. The constriction of the asci appears 

 to be caused by the pressure of the encircling edge of ruptured 

 cuticle and to be greater when the asci are scattered. 



Pkyllosticta populina Sacc. On Populus deltoides. Prescott. 

 The light grey spots are circular to subcircular with a narrow 

 brown margin, 4— 8mm. in diameter. It was associated with a 

 Septoria. 



In Ellis & Everhart's ''The North American Phyllostictas" 

 under Pkyllosticta grossulariae Sacc. reference was made to Wis- 

 consin material on Ribes floridum (= R. americanum) but it ap- 

 pears not to have been placed in my herbarium and was not re- 

 corded in the provisional list. I have found it on Ribes vulgare 

 (cult.) at Fountain City accompanying Cylindrosporium ribis 

 but mostly immature. 



Pkyllosticta crataegi (Cke.) Sacc. On Crataegus. Maiden 

 Rock. This appears to be very close to what has been called 

 Pkyllosticta destruens Dcsm. on Prunus virginiana and Amel- 

 anckier. 



Vermicularia liliacearum West. Specimens on leaves of 

 Streptopus roseus appear to be parasitic as one might perhaps 

 expect from the relation of this fungus to Collet otrickum by rea- 

 son of its imperfect pycnidia. The sporules are narrow 

 (3-4/a) in this collection. 



Placospkaeria punctiformis (Fckl.) Sacc. On Galium boreale. 

 Bridgeport. The spermogonial state of Pseudopeziza repanda 

 (Fr.) Karst. . 



Ascochyta marginata n. sp. Spots circular to subcircular, 

 5-15 mm. in diameter, at first green becoming brown with a 

 paler central portion and a darker periphery and a distinct nar- 

 row margin ; pycnidia epiphyllous, scattered, pale brown, irregu- 

 larly globose, about 100/i. in diameter with a thin cellular wall 

 and a dark ring around the pore ; sporules hyaline, ovoid to ob- 

 long with rounded ends, some of them uniseptate, 6-12 x 2-3 1 /^/*. 



