Davis — Parasitic Fungi in Wisconsin — 111. 253 



Plwmopsis vexans (Sacc. & Syd.) Harter is the name given 

 by Harter to the fungus recorded in the provisional list under 

 the name Phyllosticta hortorum Speg. (Journ. Ag'l Research 

 5:338). 



The Septoria which occurs on Agrimonia in Wisconsin bears 

 smaller sporules than the Septoria agrimoniae-eupatorii Bomm. 

 & Rouss. of Europe as described. They are usually 25-40 x 1/a. 



There is considerable variation in the appearance of Septoria 

 on Echinpcystis in Wisconsin. The spots are commonly small, 

 round and arid such as are attributed to Septoria sicyi Pk. and 

 S. brencklei Sacc. Sometimes, however, they are angular, inter- 

 venular, green becoming brown. This is more nearly the kind 

 of spot described under Septoria echinocystis E. & E. Both 

 types of spot are sometimes found on the same leaf. Dr. R. A. 

 Harper kindly compared a Wisconsin specimen with green to 

 brown angular spots with the type of Septoria echinocystis E. 

 & E. in the Ellis herbarium and wrote as follows : "The spores 

 agree as to size etc. The spots in the type are larger, more 

 brownish in color and rounded with a well defined center. It 

 seems however that it ought to be the same thing." {In lit. 

 Apr. 30, 1914) As these two kinds of spots intergrade I cannot 

 consider them as due to specific distinctness of the infecting 

 agents but rather as shade and moisture forms on one hand and 

 the results of sunshine and dry air on the other, the latter con- 

 ditions favoring a process of delimitation. As to the size of the 

 sporules I find them to range from 20-60 x l-2fi. In the form 

 with round arid spots they are usually shorter than in the one 

 with angular green-brown spots. For instance in a collection 

 that could be referred to S. brencklei Sacc. most of the sporules 

 are about 36^ long with an extreme length noted of 48/t. The 

 collection of the S. echinocystis type from which a specimen was 

 sent to Dr. Harper for the comparison has sporules 35-55 x 

 l-iy^fj.. There seems to be no reason as yet for changing the 

 record of these forms from Septoria sicyi Pk. 



The entry Septoria stachydis Rob. & Desm. in the Wisconsin 

 lists seems to have been founded upon immature specimens of 

 another fungus. 



In returning a portion of the type specimen of Septoria inter- 

 media E. & E. Mr. Ellis wrote as follows on the packet: "There 



