256 Wisconsin Academy of Sciences, Arts, and Letters. 



Solidago vlmifolia where given as a host of Ramularia vir- 

 gaureae Thuem. in the provisional list should be placed under 

 Ramularia serotina E. & E. instead. Ramularia virgaureae 

 Thuem. seems to vary from an Ovularia to a Cercosporella type. 



Piricularia parasitica Ell. & Evht. When well developed the 

 conidia are produced into long slender tips as in Cercospora and 

 may attain a length of 50/*. 



Fusicladium radiosum (Lib.) Lind. In the provisional list 

 this combination was erroneously attributed to Lindr. I have 

 assumed that this is a widespread and variable species which 

 includes the fungus occurring in Wisconsin the conidia of which 

 vary from 15-30 x 6-11/*. Venturia tremulae Aderh. in that 

 case is the ascogenous state. Peck's description of his Clado- 

 sporium letiferum (40th Report, p. 64) applies very well to the 

 fungus occurring in Wisconsin and I therefore take it to be a 

 synonym. Quite different material was collected on Populus 

 tremuloides at Pepin in August and referred to var. microscop- 

 icum (Sacc.) Allesch. The following notes were made from this 

 material. 



Spots 1-4 mm. in diameter, orbicular, sordid-arid above with 

 a narrow, dark, raised margin, alutaceous below also with a dark 

 margin and a central paler portion on which the conidiophores 

 are borne ; conidia continuous, 15-18 x 4/*. This differs from the 

 variety, as described, in the narrower, continuous, hypophyllous 

 conidia as well as in the character of the spots. 



In the 4th supplementary list, p. 78, I gave notes of a speci- 

 men that I had referred to Cercospora megalopotamica Speg. To 

 indicate something of the variation I add notes regarding two 

 further collections: Spots suborbicular, definite, immarginate, 

 blackish brown becoming paler with age and finally white in the 

 center, 2-10 mm. in diameter; conidiophores tufted, septate, 

 smoky brown, 55-80 x 4-5/* ; conidia slender, straight, attenuate, 

 pluriseptate, 60-125x3/*. On Bidens connata, Price County, 

 Sept. 9th, 1911. 



Spots suborbicular, light brown with a purple margin and a 

 white center, paler and devoid of purple below, 4-8 mm. in di- 

 ameter; conidiophores amphigenous, fasciculate, varying from 

 subhyaline to brown, straight, flexuose or bent, continuous, en- 

 tire or toothed, 15-45 x 3/* ; conidia hyaline, straight, attenuate, 



