Davis—North American Ascochytae 
663 
much larger, extending for 2 cm. and nearly surrounding the 
limb. These spots appear to be formed from the altered sub¬ 
stance of the bark which is changed in color and cracks away, 
around the margin, from the surrounding bark which remains 
in its normal condition; perithecia at first solitary, a single one 
erumpent in the center of the circular disk, finally 2-4 or more 
scattered on the same disk; sporules oblong or oblong-elliptical, 
smoky-hyaline, uniseptate, 6-8 x On living limbs of 
Pyrus malus. 
35 Ascochyta medicaginis Bres. 
Hedwigia 39: 326. 
(Ascochyta medicaginis Fckl. was referred to Phyllosticta by 
Saccardo.) 
Spots amphigenous, small, pale, angular, clustered; pycnidia 
somewhat flattened at base, apex prominent, pale straw color dry¬ 
ing black, walls parenchymatous, 200xl60/z; sporules hyaline, 
cylindrical, straight or somewhat curved, becoming uniseptate, 
16-26 x3%~5/a (‘‘ 12-20 x 3-6”)- On leaves of Medicago lupn~ 
lina. 
36 Ascochyta meliloti (Trel.) 
Gloeosporium (Marsonia) meliloti Trel. Trans. Wis. 
Acad. 6:120 (16); Ascochyta caulicola Laubert; 
Ascochyta lethalis Ell. & Barth. F. Col. 1808. 
Spots orbicular to elliptical, sordid with a dark purple or 
brown margin, 2-5 mm. in diameter, often confluent; pycnidia 
globose, prominent, brown, darker about the ostiole, 100-180 /a; 
sporules hyaline, oblong, uniseptate, constricted, straight or 
curved, 10-18 x 3%-5%/a. On stems and sometimes leaves of 
Melilotus alba. 
37 Ascochyta margin at a Davis. 
Trans. Wis. Acad. 18 : 263. 
Spots circular to subcircular, at first green becoming brown 
with a paler central portion and a darker periphery and a dis¬ 
tinct narrow margin, 5-15 mm. in diameter; pycnidia epiphyl- 
lous, scattered, pale brown, irregularly globose with a thin cel¬ 
lular wall and a dark round ring around the ostiole, about 100 /a; 
sporules hyaline, ovoid to oblong with rounded ends, some of 
them uniseptate, 6-12 x 2-3 %/a. On leaves of Aralia nudicaulis. 
