Davis—-North American Ascochytae 
659 
hemispherical to globose, succineous to light brown, 100-125/x in 
diameter; sporules oblong, hyaline, 2-4 guttulate, becoming 1-3 
septate, 10-18 x3-7/*. Wrinkling of the cuticle sometimes gives 
the spots the appearance of bearing radiating whitish fibrils. 
On leaves of Clematis. 
16a Yar. thalictri Davis. 
Trans. Wis. Acad. 16 : 757. 
Pyenidia smaller; sporules 8-10 x 2-3 y. On Thalictrum 
dioicum. 
17 Ascochyta compositarum Davis. 
Trans. Wis. Acad. 19: 700. 
Spots definite, subcircular to irregular, brown, 1-5 cm. long 
on large indefinite brown areas; pyenidia few, innate, succineous 
to brown, depressed-globose, ostiolate above, about 100/*. in dia¬ 
meter ; sporules hyaline, oblong to cylindrical, ends rounded, 
4-guttulate, becoming uniseptate, more or less constricted, 14-24 
x 4—6/x. On leaves of Eupatorium urticaefolium } Aster Drum - 
mondii and Helianthus strumosus. On the thinner leaves of 
Eupatorium the affected areas are lighter colored and less de¬ 
terminate. 
17a var. parva Davis. 
Trans. Wis. Acad. 19:701. 
Sporules 10-15 x 2 1 / 2 -S 1 / 2 y. On leaves of Helianthus stru¬ 
mosus. 
18 Ascochyta confusa Ell. & Evht. 
Journ. Mycol. 10 : 168. 
Spots amphigenous, round or irregular, white, thin, almost 
transparent with a narrow dark brown raised border, 2-5 mm. 
in diameter; sporules ovate or elliptical, smoky-hyaline, 7-12 
x 314-41/2^. On leaves of Smilax hispida and sp. indet. 
19 Ascochyta cornicola Sacc. 
Mich. 1:169. 
Spots irregular, white with a red border; pyenidia puncti- 
form, lenticular, ostiolate, 80/*. in diameter; sporules olive tinted, 
oblong-elliptical, uniseptate, 7-15x3%-6^. On leaves of 
Cornus. 
