254 Wisconsin Academy of Sciences, Arts, and Letters. 



was only one leaf; this is part of it. It seems to differ from 

 S. solidaginicola in its shorter spores but it may turn out after 

 all to be only a var. of the species", and then by way of post- 

 script, "Try and look into it." I think that it is now safe to 

 say that the name should be eliminated by reason of being ap- 

 plied to a short spored specimen of a Septoria that occurs in 

 Wisconsin on both Solidago and Aster and known as S. solidagi- 

 nicola Pk. According to the description the sporules of that 

 species are 4/a in diameter while in our specimens they are 

 l 1 /2-2 1 /2J Lt - Through the kindness of Dr. H. D. House I have 

 had an opportunity to examine type material and find the spor- 

 ules about l 1 /^ thick. 



Examination of Wisconsin specimens that were referred to 

 PMepspora oxyacanthae (Kze. & Schm.) Wallr. shows a fine 

 branched mycelium, inter- and intra-cellular, ramifying through 

 the affected portions of the leaves. The aerial branches of this 

 mycelium constitute the conidia which are assurgent, more or less 

 strongly curved sometimes even horse shoe shaped, pluriseptate, 

 60-100 x 4-5/*.. These form a loose white felt in patches on the 

 lower surface of the leaves which suggest a powdery mildew. 

 No spots are caused but the affected tissues finally become dead 

 and brown. 



Leptothyrium dryinum Sacc. Specimens on Quercus rubra 

 collected at Minocqua have sporules 15 x 10/m like those of Lepto- 

 thyrium maculicolum Wint. but the small fruit bodies borne on 

 large pale leaf areas are characters of L. dryinum Sacc. A 

 specimen collected at Racine is probably on Quercus ellipsoid alis. 

 Quercus alba should be stricken from the list of hosts of this 

 fungus in the provisional list as I find that the specimen in my 

 herbarium on that host is Phyllosticta phomiformis Sacc. 



I ... 



Gloeosporium septoriodes Sacc. Saccardo in his description 



states that the sporules are always continuous. Winter in his 

 description of Marsonia quercina Wint. which Saccardo gives as 

 a synonym, describes the sporules as uniseptate. Ellis & Ever- 

 hart in their description of Gloepsporium septorioides Sacc. var. 

 ■major E &. E. state that the endochrome is often indistinctly 

 divided in the center. Wisconsin specimens on Quercus rubra 

 show occasional sporules with a median septum and the two 

 halves of the sporule separate at this point resulting in two in- 



