666 Wisconsin Academy of Sciences, Arts, and Letters. 
49 Ascochyta quercus Sacc. & Speg. 
Mich. 1:162. 
Spots various, becoming whitish; pycnidia punctiform, sub- 
lenticular, 80-90/a; sporules hyaline, oblong-ellipsoid, obtuse, 
uniseptate, more or less constricted, 12 x 3-4 %/a. On leaves of 
Quercus ._ Perhaps the fungus which Trelease reported under 
this name as occurring on oak leaves in Wisconsin is not dis¬ 
tinct from Marssonina martini (Sacc. & Ell.) Magn. 
50 Ascochyta quercuum (Cke.) Sacc. 
(Sphaerellopsis quercuum Cke., Grevillea 12:23) 
Pycnidia hypophyllous, scattered, dark brown, subsup erficial, 
subglobose, 150/a ; sporules hyaline, lanceolate, uniseptate, 16 x 
4/a. On leaves of Quercus virens. 
51 Ascochyta rhei Ell. & Evht. 
Proc. Acad. Nat. Sci. Phila., 1893, p. 160. 
( Phyllosticta rhei Ell. & Evht. Joum. Mycol. 5:145.) 
Spots mostly marginal, subconfiuent, rusty brown, concentri¬ 
cally zoned, either with or without a definite, slightly darker 
limiting line surrounded by a broad border of light yellow, 1-2 
cm. in diameter; pycnidia few, visible on both surfaces of the 
leaf, slightly prominent, up to 150/a; sporules hyaline, oblong- 
elliptical, ends rounded, becoming uniseptate and mostly con¬ 
stricted, 5-12 x 2%-4/a. On leaves of Rheum. 
52 Ascochyta rhynchosiae (Thuem.) Sacc. 
Sacc. Syll. Fung. 3: 398. 
Spots irregular, dark brown with a darker margin; pycnidia 
epiphyllous, scattered, immersed, black, globose ; sporules hya¬ 
line, fusiform, acute at each end, uniseptate, 9 x 3/a. On Rhyn- 
chosia simplicifolia. 
53 Ascochyta rubi Lasch. 
Bot. Zeit. (1848) p. 294. 
Spots pale; pycnidia subglobose, blackish brown; sporules 
exuded in white cirri. On Ruhus. 
54 Ascochyta Sambuci Sacc. 
Mich. 1:168. 
Spots indefinite, becoming whitish and arid; pycnidia few, 
punctiform, ostiolate; sporules olivaceous, fusoid, uniseptate, not 
