698 Wisconsin Academy of Sciences, Arts, and Letters. 
ends, usually straight, continuous, fuligenous to brown, 18-24 
x9/*. On leaves of Betula alba papyrifera. Maiden Rock, 
Wisconsin, August 5th, 1916. 
Ascochyta graminicola Sacc. On leaves of Calamagrostis 
canadensis. Maiden Kock. Of this collection the following 
notes were made: Spots definite, sordid white, purple bor¬ 
dered, oval to oblong, 5-8 mm. long, sometimes confluent; 
pycnidia numerous, depressed-globose, wall thin, parenchyma¬ 
tous, ostiole surrounded by a black ring, about 120/a in diameter; 
sporules hyaline, fusiform, acute, at both ends, uniseptate, 15-20 
x 21/2-3/*. The sporules resemble those of Darluca filum (Biv.) 
Cast. 
Specimens on Actaea rubra collected at Blair, July 17, 1916, 
have the following characters: On indefinite, blackened, dying, 
areas of the leaves the cuticle on the upper surface of which is 
sometimes wrinkled in dendritic lines; pycnidia mostly epiphyl- 
lous, scattered, amber colored, globose, about 100/a in diameter; 
sporules hyaline, cylindrical, uniseptate, 17-24x5-6/*. The 
pycnidial wall is at first hyphal but at maturity consists of a 
single layer of flat polygonal cells and is not thickened around 
the ostiole. This appears to be Actinonema actaeae (Allesch.) 
Died. Stagonosporopsis actaeae (Allesch.) Died, and probably 
Marsonia actaeae Bres. which is Marssonina actaeae (Bres.) 
Magn. It differs from Ascochyta clematidina Thuem. in the 
size of the sporules as the latter does from the form on Thalic- 
trum that I have called var. thalictri (Trans. Wis. Acad. 
16:557). I have labeled the specimen Ascochyta actaeae 
(Bres.) n. comb. These three forms are so similar that it seems 
to me that it would be proper to indicate the fact by group¬ 
ing them in a single species. On Thalictrum the sporules are 
8-10 x 2-3/a, on Clematis 10-15 x 3/*, on Actaea, 17-24 x 5- 
6/*. Such series on the same or on related hosts seem to be not 
uncommon, but there appears to be no way in the present state 
of taxonomy to indicate the relationships by grouping them, 
especially as increased spore length often brings increased septa- 
tion and thereby passes generic limits as now understood. 
Ascochyta imperfecta Pk. On Medicago sativa (cult.) Madi¬ 
son. Sporules 8-11 x 3-3%/a. 
