60 Bulletin 313 



DiAPORTHE BATATATis Harter & Field (= Phoma hatatcs E. & H., 

 page 70).- — On the roots, stems and leaves of the sweet potato. 

 Causes a dry rot. Pycnidia loosely grouped, emersed, erumpent, 

 ostiolate 60-13 x 60-110 yu,. Conidia oblong to fusoid, non-septate, 

 usually 2-guttuate, hyaline, 6-8 x 3.5 /n. Peritliecia subglobose, 120-j 

 370 /x; asci clavate to cylindrical, 23-38 x 7-12 yu,; ascospores oblong 

 to fusoid, 1-septate, slightly constricted, 2-4 guttulate, hyaline, 8-12 

 X 4-6 fx. 



2%7. Cross-section of infected sweet potato showing rot following inocula- 

 tion. 288. Small root showing pycnidia. 289. Pj-cnidia, 2/3. 290. Spores 

 from same, 1/12. 291. Pycnidium from culture, 1/12. 292. Spores from 

 same, 1/12. 293. Pcrithecia from culture, 2/3. 294. Asci, 1/12. 295. Asco- 

 spores, 1/12. 296. Scolecospores, 1/12. 



Endothia parasitica (Murrill) And. — On the branches and 

 trunk and sometimes on the fruits of the chestnut. Causes very 

 pronounced cankers and finally kills the tree. Pycnidia large, 

 densely grouped, smooth or nearly so, loculated; pycnosporesi 

 emerging in tendrils, pale yellow, 1-3.5 /a; perithecia grouped, flask-j 

 shaped with long necks, ostiolate; asci oblong-clavate, 45-50 x 9 /*;' 

 ascospores oblong, uniseptate, slightly constricted, hyaline, 9-10 x 

 4-5 /.. 



297. Cross-section of stroma showing pycnidia, 2/Z. 298. Pycnospores, 

 1/12. 299. Cross-section of stroma showing perithecia, 2/3. 300. Asci, 1/6 

 and 1/12. 3'01. Ascospores, 1/12. 



